This belt replaces a 3/16" round O-ring belt. It is made from 1/8" cord. It is identical to clear 83A urethane, but only black. NOTE: The twisted belt should be 6% shorter than the round O-ring belt it replaces! Twisted belts are typically stretched 16-20%. Measure the twisted belt tip-to-tip, do not include the hook in the cut-length. Note crimping the standard metal hooks after installation may increase belt lifespan.