Powergrip-gt4 Synchronous g4 timing belts made by Gates have teeth on the underside of the belt that join with the grooves in a rotating pulley to transmit power at a constant speed without slippage. They are made of compounded rubber and are reinforced lengthwise with ethylene elastomeric material added strength. The belts require minimal re-tensioning and maintenance, no lubrication, and provide quiet operation. Timing belts are used in industrial applications such as agriculture, textile manufacturing, mining, and printing machinery, and consumer application