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Large selection: you will receive 100 rubber stoppers, available in 8 different sizes. Sufficient quantity, full specifications and varied choices to meet your different needs. Excellent Material: The conical stopper is made of high-quality silicone rubber, which has good flexibility and high hardness and cannot be easily damaged. They have excellent sealing, high and low temperature resistance, solvent resistance and acid and alkali resistance. Good sealing: our solid rubber stopper has a smooth surface, does not deform easily, and has good sealing, which can well isolate the container from air and effectively prevent liquids, powders, and gases from escaping. EASY TO USE - With its tapered design, our tapered plug fits perfectly with holes of different sizes. They are highly elastic and flexible and are easy to install and remove. Easy to clean, no residue and reusable. Enjoy the perfect hold and easy handling of our rubber stoppers. Large application: the sealing stoppers offer perfect protection for containers to be closed such as reaction tubes or to cover holes to avoid the penetration of paint and chemical liquids during powder coating, spray painting, oil filling, etc. and are often used in laboratories and in the construction industry.