Buna-N Round Cord, Cross Section Actual 0.312 in, Overall Diameter 5/16 in, Color Black, Material Buna-N, Durometer 70A, Standard, Maximum Temperature 210 Degrees F, Minimum Temperature 0 Degrees F, Overall Length 50 ft, Tensile Strength 725 psi, Round, Abrasion Resistance Good, Chemical Resistance Fair, Oil Resistance Excellent, Water Resistance Good, Weather Resistance Fair, Cross Section Fractional 5/16 in