MAST TATTOO Mast Pro 1207RL Cartridge Needles 20-Pack — #12 7RL Round Liner, Clear Tip & Membrane

MAST TATTOO Mast Pro 1207RL cartridge needles are disposable #12-size 7 round liner tattoo cartridges sold in a box of 20, built for reliable lining and detailed work.

These Mast Pro 1207RL cartridges combine a clear, high-density plastic body with a membrane system and calibrated tension to reduce machine stress and minimize ink spitback. Supplied in sterile, single-use cartridges, they are designed for artists who want consistent needle grouping, easy cleaning of the tip area between color changes, and a smooth feed of ink while lining or working fine details.

Why do these cartridges suit precise lining?

The 7 round liner (#12) configuration provides a compact grouping that holds ink and delivers a controlled, concentrated line. The round-liner setup excels at outlines, intricate patterns, and small lettered work because it balances sharpness with steady ink flow.

• Seven tightly grouped needles for crisp, consistent lines
• #12 size standard suitable for fine to medium outlines
• Clear tip lets you see ink flow and needle alignment
• Membrane reduces spitback for a cleaner working field

How does the cartridge design protect my tattoo machine and workflow?

Each cartridge uses calibrated internal tension to match pen machines’ drive systems, helping reduce undue stress on the motor and extending comfortable run time. The membrane barrier prevents fluid from entering the grip and machine, lowering maintenance needs and keeping the pen sanitary between procedures.

• High-density clear plastic body resists deformation under pressure
• Perfect tension settings reduce machine strain and heat buildup
• Internal membrane limits ink and fluid backflow into the device
• Disposable single-use packaging eliminates sterilization steps

What practical benefits will I notice during a session?

Artists will quickly notice improved visibility at the needle tip thanks to the transparent housing, which makes color changes and tip cleaning more efficient. The fluid ink delivery and stable needle grouping make continuous lines more predictable, so shading transitions and touch-ups are easier to manage.

• Transparent body simplifies cleaning and color-change checks
• Smooth, consistent ink feed for steady line work
• Disposable cartridges save prep time and reduce cross-contamination risk
• Standard fitting fits most cartridge-compatible rotary pens

How should I use and replace these disposable cartridges safely?

Fit the Mast Pro 1207RL cartridge into a compatible cartridge-style pen using a firm push until secure. Use each cartridge for a single client or session, then discard in an approved sharps container; do not attempt to sterilize and reuse.

• Install by pushing into the cartridge pen until it locks in place
• Replace when needle performance drops or after each client
• Dispose of cartridges in compliant medical/sharps waste receptacles
• Store unopened boxes in a cool, dry place out of direct sunlight

Who is this for: Professional and apprentice tattoo artists who use cartridge-style rotary pens and need dependable, disposable liners for fine outlines, lettering, and detailed work. These Mast Pro cartridges are suited for busy shops that value predictable tension, minimal maintenance, and quick tip visibility during color swaps. They provide a cost-effective boxed supply of 20 sterile cartridges for studios focused on hygiene, consistency, and ease of use without altering equipment setups.