This is the 11x155mm Center Universal Driveline for the Axial Yeti XL Monster Buggy Rock Racer. Steel construction Works with the AX31221 WB XL driveshaft coupler, AX31225 123mm Universal Joint Dogbones and the AX31222 Center Universal Joint Rebuild Kit 11x155mm Center Universal Driveshaft jxs 10/31/14 ir/jxs &