United Scientific Stoppers, Rubber, Size 1-6
ETA hand2mind 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. The 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.