Tube Stock, Polycarbonate, Grade Standard, Plastic Length Tolerance Oversized/-1.000 in, Outside Diameter 4 in, Inside Diameter 3 3/4 in, Clear, Plastic Clarity Clear, Shape Round Tubes, Impact Strength 14.0 ft-lb/in, Friction Coefficient 0.53, Water Absorption 0.13 Percent, Plastic Density 0.043 lb/cu in, Plastic Hardness Rockwell R120