United Scientific Supply Rubber Stoppers,1-Hole

United Scientific Supply These black stoppers are made of solid natural rubber that stays pliable over a long period of time Ideal for use with non-aggressive or concentrated solutions Low sulfur content Withstand temperatures from –25 to 70 Degree C (–13 to 158 Degree F) Available in solid, one-hole, and two-hole versions Each stopper has its size marked in raised figures All stoppers are 25mm tall Sold as one-pound bags - USS