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
Rolling friction car kit, provides four cars for exploration into the force of friction, Each car provides a set of different material wheels (wood, fabric, soft rubber, soft silicone), Weight (lb): 1.0, Length (in):5.8, Width (in):6.5, Height (in):3.5
Electrical Whirl, Three-pointed star wheel with all the points curved in one direction mounted on a short stand and the stand is provided with a 4 mm connection socket, Rotates freely on a pivot point mounted on a short stand and the stand, Diameter: 95 mm