20x Black Rubber Conical Stoppers, 5mm Diameter

These high-quality, black rubber conical stoppers (20 pack) are ideal for sealing flasks, test tubes, jars, and other laboratory glassware. Each stopper measures 13mm in height, with a larger diameter of 7mm and a smaller diameter of 3mm. The center diameter is 5mm. Manufactured from a chemically and thermally resistant rubber compound (GOST 7852-76, 23-6-3), these stoppers are durable and reliable. Please note: These stoppers have a characteristic rubber odor; consider this when using them for non-laboratory applications.

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