rubber stopper for test tube 1.Material:rubber 2.Size:different size 3.Used for glass bottle,pot,canister,tube, Pipe rubber stopper for test tube 1. Material ... : 100% Food grade silicone 2. Size: Different size3. Used for glass bottle, ... Maqiao Industrial zone, Haining City, Zhejiang province, China Zip314419 rubber stopper for test tube