Consist of: 1. Stainless steel canular, Standard AISI 304, 25G, 27G, or 30G, length 25mm, 32mm, 38mmm 2. Hub: Made of medial grade PVC, with inside screws. Self-tapping ribs placed on the outside of the hub. 3. Cover: Top over is made of non-tran***rent PE with skidproof stria, nether cover is made of Tran***rent PE.