Characteristics: 1. Tyre tension nozzle: all copper material, tail insert 6.5mm, screw thread type, good sealing. 2. surface treatment: the use of pure copper speed nozzle, the surface is cleaned by a new process, beautiful and shiny, no stains. Three. Anti-slip design: soak up design, better anti-slip, screw up and don't slip. Four. Rubber washer: an internal rubber package, waterproof and leak-free. Five. Easy to install: These bike adapters are very lightweight and can be left on the Pre