Plastic Ball Stock, Polypropylene, Plastic Diameter 3/8 in, Tensile Strength 4,200 psi, Impact Strength 1.2 ft-lb/in, Plastic Diameter Tolerance +/-0.002 in, Plastic Hardness Rockwell M85, White, Weight 0.2 lb, Grade Standard, Friction Coefficient 0.5, Plastic Clarity Semi-Clear, 0.033 lb/cu in, Tensile Strength Rating Poor, Water Absorption 0.01 Percent, Standards , UL 94 HB, Minimum Temperature 0 Degrees F, Maximum Temperature 180 Degrees F, Package Quantity 100