This belt replaces a 3/32" round O-ring belt. It is made from 1/16" (1.6mm) cord. NOTE: The twisted belt should be 6% shorter than the round O-ring belt it replaces! Twisted belts are typically stretched 17-20%. Measure the twisted belt tip-to-tip, do not include the hook in the cut-length. Note crimping the metal hooks after installation may increase belt lifespan.