United Scientific Assorted Rubber Stoppers, Size 1-6

These rubber test tube stoppers are designed for lab and classroom use. Rubber stoppers are more durable than cork, and are less likely to disintegrate and leave debris inside the tube. This set of assorted rubber stoppers range from size 1 to 6 and include solid-top stoppers and one-hole stoppers.

The set includes the following breakdown 10 each of solid stopper sizes: #1, #2, and #3. 10 each of the following one-hole stopper sizes: #1, #4, and #5½. Also included in this set are 8 solid stoppers of #5, and 4 each of #6 solid and one-hole stoppers for a total of 76 stoppers.

Science education products incorporate applied math and science principles into classroom projects. Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Science education projects include a broad range of activities, such as practical experiments in engineering, aeronautics, robotics, energy, chemistry, physics, biology, and geology.