WJX Cartridge Needles is patent design make the needles run extremely stable and smooth, have the Lowest Tin solder to avoid chemical process to ensure safety. Special Rebound - there is four special elastics that lighten the pressure the needles bar Medical Grade LG PC - made by PC polycarbonate, Polycarbonate is colorless, transparent, heat resistant,impact resistant. Original Design - WJX patent cartridges design achieve better hitting skins performanceNew Shell Design The design of ink guide groove is added under the needles nozzle to increase ink storage. The protruding part becomes the track when the needles is out. With the arc clamp limiter on both sides of the needles nozzle, the friction coefficient is reduced, the stability of the needle is increased and the smooth needle and ink flow are guaranteed. Special Rebound There is four special elastics hold on rebound that lighten the pressure of the needle bar, working silence. Medical Grade LG PC The frame made by PC polycarbonate, Polycarbonate is colorless, transparent, heat resistant, impact resistant, flame retardant, BI grade, and has good mechanical properties at normal use temperatures. Lowest Tin Solder The needles wire is fixed by fogging and discharging needles, plastic sets and precise moulds, which greatly reduces the welding process, thus avoiding the chemical pickling process and ensuring the safety and hygiene of each needle wire. Original Design From the outer needle shell to the needle thread, and even every part, we have carried out layer screening and testing to make a needle run smoothly, save more ink, fast color, low skin loss, and every detail is critical.Best Sellers Rank: See Top 100 in Beauty & Personal Care. : B07Z5RXL6R. Manufacturer: MAST TATTOO. Item model number: wjx-rl. Package Dimensions: 6.89 x 4.13 x 2.32 inches; 5.43 Ounces.