Rubber Test Tube Stoppers, Size #4, Set of 6

This set of 6 Rubber Test Tube Stoppers are laboratory grade and are marked with the size number for easy identification. These rubber stoppers contain a high percentage of pure rubber and are low in free sulfur. The stopper composition ensures resiliency and pliability over a long period and will withstand laboratory conditions without hardening. The upper working temperature of these rubber stoppers is 212°F.

For use with our 25mm x 150mm Test Tubes.

Contains:

• 6 Solid Rubber Stoppers

Product Details:

• Recommended Ages: 8 and up
• Product Size: #4 (top diameter is 26mm, bottom diameter is 20mm, length is 25mm)
• Material: Solid Rubber
• Stopper Color: Varies (Black or Blue)

WARNING! CHOKING HAZARD - Small parts. Not for children under 3 years.