Salient features of Dispovan 3ml syringe With 24G Needle : Barrels are made of non-toxic, medical-grade polypropylene compatible with any medication. The tip of the barrel is of two types – luer mount and Luer lock. Both have a 6% luer taper as per ISO:594. Plungers are made of non-toxic, medical-grade polypropylene compatible with any medication. Gaskets are made of natural rubber which is chemically inert and compatible with medication for short term contact drug delivery application.