Commonly known as acetal copolymer, this material is the easiest to machine , wear-resistant, and moisture-resistant. This Product is Manufactured in China. Diameter: 3/8"; Diameter Tolerance: (-0.000" - +0.027"); Length: 6 ft.; Length Tolerance: (-0.000" - +7.134"). Color: Black; Clarity: Opaque; Tensile Strength: 9,100 psi; Tensile Strength Rating: Good; Imact Strength: 1.1 ft.-lbs/in.; Impact Strength Rating: Poor. Coefficient of Friction: 0.35; Friction Rating: Slippery; Water Absorption: 0.0022; Water Absorption Rating: Good; Density: 0.051 lbs / cu. in.. Hardness: Rockwell M90; Temperature Range: -50° to 180° F; Specifications Met: UL 94 HB.