Alpha round liners cover the everyday lining work most artists do without thinking about it — outlines, script, fine detail, blackwork. The RL grouping pulls clean and holds a steady point, so a single pass lays a solid line instead of a ragged one, and the price makes them easy to stock in volume.The needles run on a safety membrane that stops backflow into the grip, and the soldering keeps the grouping tight enough to avoid wobble on longer pulls. They drop into any standard cartridge machine or grip.Specs Configuration: Round Liner (RL) Sizes from #04 / 0.18 mm, 3-round up Membrane: anti-backflow safety system Fits all standard cartridge grips and machines Works well for Traditional & neo-traditional outlines Fine line and single-needle detail Blackwork Lettering and script