For use with RowErgs, Model C, D and E Indoor Rowers. Genuine Concept2 Drive Chain Assembly 1915 for RowErg Model C D E Indoor Rowers. For use with RowErgs, Model C, D and E Indoor Rowers. This kit includes 14 tooth quiet sprocket, axle, chain idler pulley, nickel chain with connectors and swivel, shock cord, 17mm bearing, 17mm bearing cup, screws and nuts.