Stopper 1-Hole Rubber 56mm 48mm 11 6lb , Each

Details:

Stopper 1-hole rubber 56mm 48mm 11 6lb^ 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: 11, top diameter: 56 mm, bottom diameter: 48 mm, 6l