Polycarbonate is clear for applications that require seeing through the and has excellent resistance to impact, shock, and strikes. This Product is Manufactured in China. Diameter: 3"; Diameter Tolerance: (-0.010" - +0.010"); Length: 1/2"; Length Tolerance: (-0.032" - +0.032"). Color: Clear; Clarity: Clear; Tensile Strength: 9,700 psi; Tensile Strength Rating: Good; Imact Strength: 14.0 ft.-lbs/in.; Impact Strength Rating: Excellent. Coefficient of Friction: 0.53; Friction Rating: Not Slippery; Water Absorption: 0.0013; Water Absorption Rating: Good; Density: 0.043 lbs / cu. in.. Hardness: Rockwell R120; Temperature Range: -40° to 240° F; Specifications Met: UL 94 V-2.