Moose Offroad Rear Aluminum Sprocket Rear Sprocket - Aluminum - 43 Tooth - Black - BetaFeatures The 7075 T651 aluminum we use for these sprockets receives an extra tempering which reduces distortion and provides optimal thickness vs. typically thinner 7075 T6 sprockets 100% machined, no stamping or grinding Optimal tooth thickness results in maximum tooth and chain contact Specs Product Name Sprocket Type Drive Color Finish Black Material Aluminum Tooth Count 43 Chain Size 520 Mounting Position Rear Units Each Riding Style Adventure