Product Features: The product models and specifications are complete, including 1.4 (17G), 1.6 (16G), 1.8 (15G) and 2.1(14G); Adopt high elastic medical grade materials with good elasticity. The inner wall of the tubing is smooth, without burr and depression; Adopt high-quality Japanese imported needles and ultra-thin double-curved sharp needle tips to reduce tissue damage and pain; Fine and uniform silicification treatment, good biocompatibility and less puncture needles; Ergonomic clamp design make operation simple and convenient. The anti-slip wing design with concave-convex buckle is more in line with clinical use. Safety A.V.fistula needle: Protective caps can effectively prevent from being punctured by the needles, avoid blood contamination and protect clinical users.