... 1).Used for disposable syringe 2).With slick and intact appearance 3).Highly sealing and sliding performance Size0.3ml, 0.5ml, 1ml, 2ml, 3ml, 5ml ... polyisoprene, rubber butyl rubber), silicone rubberFunctionit is a part of disposable syringe, highly sealing and sliding performance, prevent liquid overflow from ... us. We will do our best to serve you. Rubber Medical Piston for Syringe