Made of billet 6061-T6 aircraft quality aluminum,these pulleys feature gear cut teeth to RMA standards. Pulley is show polished and the chrome plated inner and outer flanges are shrunk to fit the pulley. This type of flange installation allows the teeth to cut before the final assembly of the flanges resulting in a full width tooth design. Even belt wear with maximum contact can now be achieved. For best results always install a new drive belt and transmission pulley when installing a new rear pulley.