Round Liner Tattoo Cartridges for Precise Line Work
R&G Bio manufactures round liner tattoo cartridges for distributors, studio chains and private-label brands worldwide. The round liner is the workhorse of every cartridge line — and the configuration buyers reorder most.
Our round liners do one thing well: draw clean, accurate lines. Available in #08, #10 and #12 gauges, from tight 1RLs up to bold 14RLs, with consistent ink feed and a stable needle seat — so the last cartridge in the box performs exactly like the first.
Every cartridge is EO gas sterilized, batch-coded for full traceability, and produced in ISO Class 7 cleanrooms under an ISO 13485 quality system. Review our certifications and compliance documents and see how we manufacture before you place a bulk order.
We support full OEM/ODM programs — housing colors, private labeling and custom packaging built around your brand, with factory-direct MOQs and tiered wholesale pricing.
Model Reference
For example – 0801RL
08 – Needle Diameter (Gauge)
01 – Needle Count
RL – Needle Configuration
Needle Diameter (Gauge)
08 = #8 (Bugpin, approx. 0.25 mm)
10 = #10 (Standard, approx. 0.30 mm)
12 = #12 (Standard, approx. 0.35 mm)
Needle Count
01 / 03 / 05 / 07 / 09 / 11 / 13 / 14 / 15 / 17 / 18 / 23 / 27
Needle Type
RL = Round Liner
RS = Round Shader
M1 = Magnum (Double Stack)
RM = Round Magnum
CM = Curved Magnum
F = Flat Shader
RLT = Textured Round Liner
TRL = Turbo Round Liner
STL = Super Tight Liner
#08 SERIES · 0.25MM BUGPIN — THE FINEST STANDARD LINERS
|
MODEL |
GAUGE |
TAPER |
NEEDLE COUNT |
MEMBRANE |
STERILIZATION |
FIT |
TYPICAL USE |
|---|---|---|---|---|---|---|---|
|
0801RL |
#08 · 0.25mm |
Short 0.70mm |
1 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Single-needle hairlines, micro detail, ultra-fine script |
|
0803RL |
#08 · 0.25mm |
Short 0.70mm |
3 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Fine lines, small script, delicate detail outlines |
|
0805RL |
#08 · 0.25mm |
Short 0.70mm |
5 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Fine-to-medium outlines, gentle work on sensitive skin |
|
0807RL |
#08 · 0.25mm |
Short 0.70mm |
7 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Medium outlines with soft deposit, illustrative work |
|
0809RL |
#08 · 0.25mm |
Short 0.70mm |
9 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Medium-bold outlines on detailed designs |
|
0811RL |
#08 · 0.25mm |
Short 0.70mm |
11 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Bolder outlines that still need a gentle touch |
|
0814RL |
#08 · 0.25mm |
Short 0.70mm |
14 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Wide bugpin lines, small solid fills |
#10 SERIES · 0.30MM STANDARD — THE EVERYDAY LINER RANGE
|
MODEL |
GAUGE |
TAPER |
NEEDLE COUNT |
MEMBRANE |
STERILIZATION |
FIT |
TYPICAL USE |
|---|---|---|---|---|---|---|---|
|
1001RL |
#10 · 0.30mm |
Short 0.70mm |
1 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Fine single lines, realism details, hair strokes |
|
1003RL |
#10 · 0.30mm |
Short 0.70mm |
3 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Fine line tattoos, small lettering, detail outlines |
|
1005RL |
#10 · 0.30mm |
Short 0.70mm |
5 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Clean fine-to-medium outlines, script work |
|
1007RL |
#10 · 0.30mm |
Short 0.70mm |
7 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Everyday outlines, traditional and lettering work |
|
1009RL |
#10 · 0.30mm |
Short 0.70mm |
9 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Bold outlines, thick lettering strokes |
|
1011RL |
#10 · 0.30mm |
Short 0.70mm |
11 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Heavy outlines, solid small shapes |
|
1014RL |
#10 · 0.30mm |
Short 0.70mm |
14 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Very bold lines, blackwork borders, small fills |
|
1018RL |
#10 · 0.30mm |
Short 0.70mm |
18 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Maximum-width lines, large-scale bold work |
#12 SERIES · 0.35MM STANDARD — BOLDEST STANDARD LINER FLOW
|
MODEL |
GAUGE |
TAPER |
NEEDLE COUNT |
MEMBRANE |
STERILIZATION |
FIT |
TYPICAL USE |
|---|---|---|---|---|---|---|---|
|
1201RL |
#12 · 0.35mm |
Short 0.70mm |
1 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Strong single lines, whip details, fine stipple |
|
1203RL |
#12 · 0.35mm |
Short 0.70mm |
3 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Fine-to-medium outlines with more presence |
|
1205RL |
#12 · 0.35mm |
Short 0.70mm |
5 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Everyday bold outlines, old school work |
|
1207RL |
#12 · 0.35mm |
Short 0.70mm |
7 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Classic bold outlines, traditional pieces |
|
1209RL |
#12 · 0.35mm |
Short 0.70mm |
9 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Heavy outlines, large lettering |
|
1211RL |
#12 · 0.35mm |
Short 0.70mm |
11 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Very heavy outlines, fast small fills |
|
1214RL |
#12 · 0.35mm |
Short 0.70mm |
14 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
Maximum bold lines, blackwork borders |
|
1218RL |
#12 · 0.35mm |
Short 0.70mm |
18 |
Yes, built-in |
EO Gas · ISO 11135 |
Universal cartridge grip |
The widest liner line — large-scale bold outlines |
Built Like a Medical Device, Priced for Wholesale
A liner lives or dies by its point. We control every step in our own factory, from needle grinding to sterile packing. Here is what goes into each RL cartridge.
01 Tight Machine-Soldered Grouping
All needles in the grouping are drawn to one point and soldered by machine, not by hand. Every liner in a batch forms the same point, so the line you test in a sample is the line you get in production.
02 Safety Membrane System
A medical-grade elastic membrane sits inside every cartridge. It keeps needle tension steady during long lining sessions and stops ink and body fluids from flowing back into the grip and machine.
03 Polished 304 Needle Tips
We use Japanese-imported 304 surgical steel with mirror-polished tips. Smooth, sharp points mean clean penetration and less friction in the skin. Each grouping is soldered by machine, so the recessed center is identical across every batch.
04 Medical-Grade Housing
The shell is medical-grade polymer with a clear tip, so artists see the ink channel working while they line. Low-friction inner walls keep the needle stable. The standard fitting works with most rotary machines and cartridge grips.
05 EO Gas Sterilization
Every cartridge is sealed in its own blister pack and sterilized with EO gas. Our sterilization process is validated under ISO 11135, with batch records kept for full traceability.
06 Two-Stage Quality Control
Every unit passes 100% visual inspection on the line. Then 30% of each batch is checked again under 100x microscopy for tip alignment, solder quality, and center-channel depth.
Why Consistency Is the Whole Product
Ask any artist what ruins a liner and the answer is always the same: one crooked needle in the grouping. It scratches, it widens the line, and it chews the skin. That is why our QC focuses on the point itself — alignment, solder, and diameter, checked under 100x magnification on every batch. A good RL should feel boring: same line width, same ink flow, same behavior, box after box. Boring is what lets an artist stop thinking about the needle and think about the tattoo.
Where Turbo Liners Work Best
One job: bold, saturated lines at higher speed. If the style is outline-driven and time matters, this is the needle.
Traditional & Neo-Traditional
Old school lives on bold, confident outlines. 7RL to 14RL in #12 gauge lay the heavy contour lines this style is built on.
Fine Line & Minimalist
1RL and 3RL in #08 or #10 pull the thin, even strokes fine line work depends on — small florals, tiny symbols, micro tattoos.
Script & Lettering
Letters need one thing: consistent line weight from first stroke to last. A stable 3RL or 5RL keeps every character clean and readable.
Geometric & Ornamental
Straight lines and perfect symmetry expose any wobble in the needle. A tight, machine-soldered point keeps geometry honest.
Small Number, Fine Line. Big Number, Bold Line.
Needle count sets the line width. Gauge sets how much ink the line carries. Match both to the job.
1RL – 3RL
Fine lines, micro detail, tiny script
5RL – 7RL
Everyday outlines, lettering
9RL – 11RL
Bold outlines, traditional work
14RL – 18RL
Heaviest lines, blackwork borders
Round Liner (RL) vs Round Shader (RS)
The two most confused needle types in the catalog. Same round shape, opposite jobs — the difference is how the needles sit.
|
ROUND LINER (RL) |
ROUND SHADER (RS) |
|
|---|---|---|
|
Grouping |
Tight — all needles drawn to one point |
Loose — needles spaced apart in a circle |
|
Ink Deposit |
Concentrated in a narrow line |
Spread over a wider, softer area |
|
Skin Trauma per Pass |
Higher in the line path — do not shade with it |
Lower per point — built for repeated passes |
|
Common Sizes |
1RL – 18RL |
3RS – 18RS |
|
Best For |
Outlines, lettering, geometric lines, detail |
Soft shading, small blends, stipple, color packing in tight areas |
|
Classic Mistake |
Using it to shade — chews up skin fast |
Using it to line — fuzzy, weak outlines |
Compare with the shading side of the catalog: Round Shader (RS) cartridges. Need a liner variant? See Tight Round Liner, Textured Round Liner, and Turbo Round Liner cartridges.
Our Certifications
R&G Bio is an integrated manufacturer with verified FDA registration, ISO 13485 / ISO 9001 certification and EU RoHS compliance — the documentation your market actually requires.
Wholesale & OEM Programs
Factory-direct supply with full batch traceability. Tell us your sizes and target volume — we reply within 12 hours with a full quotation.
MOQ from 1,000 pcs
Standard sizes start low; mixed sizes allowed in one order.
Tiered Factory Pricing
The more you take, the lower the unit cost. Full price ladder with every quotation.
Fast Lead Time
Standard sizes ship from running production; OEM timelines confirmed with your quote.
Private Label & OEM
Your brand, built on our production lines — in-house design and engineering support.
Qualified B2B buyers can request a free sample kit before committing to an order.
FAQs
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Find Expert insights
About R&G Bio
Built on Precision.
Trusted Globally.
Where Precision Meets Medical-Grade Standards
ISO 13485 certified facility with ISO Class 100,000 cleanrooms. 316L surgical steel, complete traceability.
End-to-End Manufacturing Control
From needle configuration to sterile packaging, every step is precision-controlled with automated assembly and batch tracking.
Meeting International Regulatory Standards
CE Mark, FDA Registered, KFDA Approved, ISO 13485, RoHS Compliant. Full documentation for global market entry.
Trusted Tattoo Needle Manufacturer Since 2009
15+ years serving 50+ countries with premium cartridge tattoo needles and flexible OEM/ODM solutions.
OEM / ODM SERVICES
Contact us for wholesale pricing and custom configurations
Get In Touch
Request a Quotation
Tell us about your requirements and our team will respond within 24 hours with a detailed quote including pricing, lead times, and customization options.