K7378 Tube Stock Cast Acrylic Grade Standard Plastic Length Tolerance Oversized/-1.000 in Outside Diameter 3 1/2 in Inside Diameter 3 in Clear Plastic Clarity Clear Shape Round Tubes Impact Strength 0.3 ft-lb/in Friction Coefficient 0.8 Water Absorption 0.4 Percent Plastic Density 0.043 lb/cu in Plastic Hardness Rockwell M95