6061 Forged Alloy. Made to O.E.M. specifications. Correct hardness to reduce damage to frame upon impact. Includes mounting bolt. Fits some Orbea. Compatibility:. Orbea: Aletta - 2009 / Alma - 2009 / Alma - 2010 / Alma 29 - 2008 / Alma Carbon - 2008 / Aqua - 2010 / Aqua Dama T23 - 2011 / Aqua Dama TDF - 2008 / Aqua Dama TDI - 2008 / Aqua Dama TT6 - 2011 / Aqua Series - 2012 / Aqua T105 - 2011 / Aqua T23 - 2011 / Aqua TSR - 2011 / Aqua TTG - 2011 / Arin - 2008