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
Linear Air Track with accessories, 1.5m length, Ideal for classroom use, Includes: (1) Linear air track, (1) Accessory pack, 63.8x7.1x12.6 inches, 24.9 pounds