... for glass bottle,pot,canister,tube, Pipe rubber stopper for test tube 1. Material: 100% Food grade silicone 2. ... Different size3. Used for glass bottle, ceramic pot, canister, and other bottles.4. Advantages: safety, Eco-friendly, water proof, damp ... StandardOrNonstandard:Style: Size and Color:Material: Nonstandardrubber stopper for test tubeas your requests,drawings or samplesRubber(NBR,SI, Viton,EPDM ...