... 3.Used for glass bottle,pot,canister,tube, Pipe rubber stopper for test tube 1. Material: 100% Food grade ... Style: Size and Color:Material: Nonstandardrubber stopper for test tubeas your requests,drawings or samplesRubber(NBR,SI, ... used in different machines, cars, hardware,construction work equipment and so onPackaging:PE and carton,according to ... province, China Zip314419 rubber stopper for test tube