Stopper 1-Hole Rubber 50mm 42mm 10 7lb ,Each

Details:

Stopper 1-hole rubber 50mm 42mm 10 7lb^ rubber stopper, 1 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: 10, top diameter: 50 mm, bottom diameter: 42 mm, 7lb