Rubber Stopper, with 1 Hole, color: black, made of solid natural rubber that stays pliable over a long period of time. Ideal for use with non-aggressive or concentrated solutions, Low sulfur content, Withstands temperatures from -25 to 70 deg C, Size: 1
Rubber Stopper Assortment, solid, assorted, one pound, color: black, are made of solid natural rubber that stays pliable over a long period of time, use with non-aggressive or concen solutions, Low sulfur content, temperatures from -25 to 70 deg, size: 1 to 6
Drilled Ball Set, 1inch Diameter, set of 12, erfect for conducting own pendulum experiments, 3mm hole is drilled down the center of each ball, Comes in a plastic container with foam padding to hold the drilled balls firmly in place