Air syringe barrels are manufactured with a heavy flange and are custom designed to withstand pressure. The barrels come in clear, UV amber, UV black opaque and ESD. We package these with a white polyethylene stopper for drip-free dispensing. However, several other options are available which include a red straight-wall stopper for high viscosity material, a red thermal stopper for low viscosity materials, or a blue plastic stopper designed specifically to reduce back pressure when dispensing cyanoacrylates. These items come in boxes of 40.