The two-piece Renthal Ducati carrier is a replacement for the O.E.M. Ducati one-piece steel sprocket that allows you to use a variety of gearing options without having to remove the carrier. Machined from billet aluminum, they are 66% lighter than the O.E. steel version, which equates to just over 1 pound weight savings. Two-piece Renthal Ducati Carrier is a replacement for the O.E.M. Ducati one-piece steel sprocket. Machined from billet aluminum. 66% lighter than O.E. steel version. Note: Sprocket NOT included.