Three parts syringe mould consists of syringe plunger mould, syringe barrel mould, syringe gasket mould. The construction consists of a rubber gasket that sits on the tip of the plunger located inside the barrel.,.Smooth-glide plunger ensures painless injection with no jerking, usually use silicone oil as lubricant.Three pieces syringe is cheaper than two part syringe, is widely  are used for injecting medications, retaining ring prevents accidental plunger rod withdrawal.