K6424 Discs Acetal Homopolymer Grade PTFE-Filled Plastic Diameter 4 in Plastic Length 1/2 in Tensile Strength Rating Good Impact Strength Rating Poor Temperature Range -40 Degrees to 185 Degrees F Brown Plastic Clarity Opaque Friction Coefficient 0.12 Plastic Density 0.0526 lb/cu in Plastic Hardness Rockwell M89 Water Absorption 0.2 Percent