3ml Safety Syringe, Safety Syringe with Retractable Needle Features: safety syringe 1ML-20ML Connector: Luer lock After use, the needle will be retractable to the barrel and the Plunger will be locked, so it is so safety after use. 1) A protection to nurse and safety for patient 2) Guaranteed single use, prevents infection from re-used needles, prevents needle-stick injuries 3) Provides a high level of protection for healthcare professionals Packing: PE packing or blister packing