Achieve Impeccable Linework with Metrix Signature Round Liners. Meet the industry standard for precision. Metrix Signature Round Liners are engineered for tattoo artists who demand flawless, consistent lines. Our signature stabilization system and hard membrane keep your needles true, while the unique air intake system promotes exceptionally smooth ink flow and help prevent clogging. Available in a wide range of groupings from 03 to 18, these professional grade cartridges are the reliable choice for creating clean, sharp lines that last. Key Features: Stabilization System: For reduced needle wobble and consistent performance. Smooth Ink Flow: Unique air intake design prevents clogging. Wide Range: Groupings from 03RL to 18RL for every lining need. Medical-Grade: Made with medical grade Japanese steel and Korean plastics.