Mystery Density Activity Set with wooden holder, which allows for efficient storage and easy access, Set of 12 bars of different length but the same diameter
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
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