6061 Forged Alloy. Made to O.E.M. specifications. Correct hardness to reduce damage to frame upon impact. Includes mounting bolt. Fits some Cannondale. Compatibility:. Cannondale: Claymore - 2011-2012 / Claymore 1 - 2013 / Claymore 2 - 2013 / FAT CAAD 1 2 - 2016-2017 / Jekyll - 2011-2012 / Jekyll 3 - 2013 / Jekyll 4 - 2013 / Jekyll Alloy - 2011-2013 / Jekyll Alloy 27.5 - 2014-2017 / Jekyll Carbon 1 - 2013 / Jekyll Carbon 2 - 2013 / Jekyll Carbon 27.5 - 2014-2017