... advantages suit for mechanism of High standard. Trailer Coil Air,Brake Coils,PA12 hose: • Material:PA,PU etc. • Hose size(OD ... . • Helix turns:12,16,18,20,22,24,26,28,30 coils.etc. • Stretched length:5m,5.5m,6.5m,7 ... -- PA (Polyamide, Nylon) TubeTube-- PU (Polyurethane) TubeTubing -- PU (Polyurethane) air brake coils, spiral hose