0.139" (3.5mm) Cross-section, Clear 83A Durometer, Welded Endless, Round O-Ring Drive Belt. FDA 1680 & 2600 food-grade Polyurethane.

This is the standard clear O-ring drive belt used on line-shaft and powered-roller conveyors. Typical stretch is 10-15%.

Measure belts by their linear cut-length (middle circumference), NOT diameter.