21 Pack Solid Rubber Stopper, Black Lab Plug, 000# – 8# Sizes Assortment, 11…
Assorted sizes are ideal for concentrated solutions,such as flask,test tube or other laboratory applications. These black stoppers are made of solid natural rubber. 11 assorted sizes: 000# 00# 0# 1# 2# 3# 4# 5# 6# 7# 8#,wide choice for your application.