Stoppers, Rubber Size 10, Solid. Pack of 1-Pound.

Our high-quality rubber stoppers are soft, non-greasy and have a durometer of 45. They are sold in a one-pound pack. These stoppers are size 10 and are solid (no hole drilled). Size 10 stoppers have top diameter of 50mm, a height of 25mm, and a bottom diameter of 42mm. Approximately 9 size 10 stoppers are included per one-pound pack. GSC International RS-10 Rubber Stoppers, Size 10, Solid, 1-Pound Pack Rubber stoppers are essential for creating airtight seals in laboratory experiments, making them ideal for chemistry, biology, and physical science classrooms. Sealing Glassware: Use rubber stoppers to securely close test tubes, flasks, and bottles, preventing spills, evaporation, or contamination during experiments. Water Displacement Demonstrations: Use rubber stoppers to seal flasks or bottles in water displacement setups, helping students visualize gas production. Custom Lab Equipment: Rubber stoppers with holes can be combined with thermometers, pipettes, or tubing to create DIY lab apparatus for various experiments. Durable and chemical-resistant, rubber stoppers are a must-have for any science classroom, helping students conduct safe and controlled investigations.  PRODUCT WARNINGS WARNING: This product can expose you to chemicals including styrene and lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov. Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under. This product consists of small items, making it a choking hazard. Only use with adult supervision.