This is a Full RACE Custom ATi Super Damper with Billet Crank Timing Sprocket for 3RZ / 2RZ. NO PROVISION FOR THE BELTS ! This is a NEW Item in the box, the billet sprocket is a longer unit designed by TRS to use with the ATI Damper. This is what all the high HP engines are using to replace the weak factory unit. This unit needs to be torqued to 200 ft lb. Factory sprockets are prone to crack and destroy the chain and your valvetrain.