Plastic Ball Stock Polypropylene Plastic Diameter 1/4 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 0.1 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 FDA UL 94 HB Minimum Temperature 0 Degrees F Maximum Temperature 180 Degrees F Package Quantity 250