Dental Needle Stainless steel canular, Standard AISI 304, 25G, 27G, or 30G, length 25mm, 32mm, 38mm Size 27G ... : Metric System ISO 7885 British System1.Stainless steel canular, Standard AISI 304, 25G, 27G, or 30G, length 25mm, 32mm, 38mm 2. Hub ... : Made of medial grade PVC.1. Stainless steel canular, Standard AISI 304, 25G, 27G, or 30G, length 25mm, 32mm, 38mm 2. Hub ...