1.S.S 304 steel 2..experienced grinding technology Absorb High quality cannula and make for Automatic needle assembly, highly-trainedoperator and staff, with good quality and competitive price.Cannula range: 15G, 16G, 18G, 19G, 20G, 21G, 22G, 23G, 24G, 25G, 26GCannula length: 1 1/2, 1 1/4, 1, 3/4, 5/8, 1/2. 23Gx1 inch medical disposable cannula