Stopper 2-Hole Rubber 64 mm 54 mm 12 5lb ,Each

Details:

Stopper 2-hole rubber 64 mm 54 mm 12 5lb^ 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: 12, top diameter: 64 mm, bottom diameter: 54 mm, 5lb