Stopper 2-Hole Rubber 20 mm 16 mm 2 45lb, Each

Details:

Stopper 2-hole rubber 20 mm 16 mm 2 45lb^ rubber stopper, 2 hole, color: black, contain a high percentage of pure rubber and weigh less than neoprene, resilient/pliable for a long time, low in free sulfur, can withstand adverse laboratory, size: 2, top diameter: 20 mm, bottom diameter: 16 mm, 45l