Cotton laminated with a phenolic resin. CE is an economical choice with moderate impact strength. This Product is Manufactured in China. Diameter: 1/2"; Diameter Tolerance: (-0.001" - +0.001"); Length: 1 ft.; Length Tolerance: Oversized. Color: Brown; Tensile Strength: 10,000 psi; Tensile Strength Rating: Good; Impact Strength: 1.7 ft. - lbs./in.; Impact Strength Rating: Poor. Coefficient of Friction: Not Rated; Friction Rating: Not Rated; Water Absorption: 0.02; Water Absorption Rating: Poor; Hardness: Rockwell M100. Density: 0.049 lbs / cu. in.; Temperature Range: 250° F; Specifications Met: UL 94 HB.