K7381 Tube Stock Polycarbonate Grade Standard Plastic Length Tolerance Oversized/-1.000 in Outside Diameter 1/2 in Inside Diameter 3/8 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