Rubber Stopper Solid 4

Rubber Stopper Solid 4 Bottom Diameter 20 mm Top diameter 26 mm Length 25 mm 

These solid, black stoppers contain a high percentage of pure rubber, weigh less than neoprene, and are low in free sulfur (1/2%).

Resilient and pliable for a long time
Low in free sulfur
Can withstand adverse laboratory conditions without hardening

Composition ensures resiliency and pliability over a long period.