United Scientific™ RSTPK4 Premium Laboratory Black Rubber Stoppers, 2 Hole | Good to Seal Bottles, Tubes and Many Other Containers - Black Lab Plug | #2 to #8 Assorted Sizes | 1LB of Stoppers.

United Scientific™ RSTPK4 Premium Laboratory Black Rubber Stoppers, 2 Hole | Good to Seal Bottles, Tubes and Many Other Containers - Black Lab Plug | #2 to #8 Assorted Sizes | 1LB of Stoppers.

• Tapered Design - Smooth and tapered sides make these stoppers easy to plug and pull. All United Scientific rubber stoppers are reusable, and promote a sustainable laboratory or classroom environment.
• Natural Rubber - Made from premium natural rubber, not easy to deform, elastic and great for sealing. Manufactured according to laboratory standards.
• Extensive Use - Rubber stopper Ideal for laboratory and industrial use, can be used to seal test tubes, flasks, etc. Available in a wide range of sizes.
• Low sulfur content. Withstand temperatures from –25 to 70°C (–13 to 158°F). They do contain latex.
• Size: #2 to #8 Assorted sizes, stoppers.