Tube Stock, UHMW Polyethylene, Grade Standard, Plastic Length Tolerance +0.060/-0.000 in, Outside Diameter 3 1/8 in, Inside Diameter 2 3/4 in, White, Plastic Clarity Opaque, Shape Round Tubes, Impact Strength No Break, Friction Coefficient 0.12, Water Absorption 0.01 Percent, Plastic Hardness 66D