The products are made by medical polymer materials. Sterilized by EO gas; sterile, non-toxic, pyrogen free. The products will be destroyed themselves after single use, and cannot really use for a second time, thus, reduce the infect of illness origin and avoid the infect among patients. Plungers of the products become destroyed themselves after single use, and lead to make no second time use. Sizes:0.5ml, 2ml, 2.5ml, 5ml, Product structure: barrel, plunger, piston, and sterile hypodermic needle Scope for use:The products are used for injection under skin, muscle and intravenous injection.