The Hornet Wave keeps you out there at your best. Designed for performance.Using Lightweight induction hardened stainless steel the Hornet Wave disc offers superior strength and durability while using MTX’s innovative technology to keep you in control under high stress braking. Constructed using one complete segment of SUS 420 stainless steel then heat-treated to HRC 36+-2. MTX’s Wave technology ensures your discs stay cool through high strain environments.All MTX discs are designed and manufactured with world-leading cutting edge technologies:Precision CNC machined and laser-cut technologyJapanese SUS 420 Stainless SteelReplacement for Original EquipmentHigh Tech Wave perforated designOptimum heat dissipationSpecifications:O.D: 245mmI.D: 115mmMinimum Thickness: 3.5mmRotor Position: Rear Fits: Yamaha WR250 2T AU 2004-2005 WR250F 2002-2004 2006-2007 2009 2011-2012 2014-2019 WR426F 2002 WR450F 2003-2007 2009 2011-2021 WR450FSP 2021 YZ125 2002-2009 2011-2020 YZ250 2002-2008 2011-2015 2017-2020 YZ250F 2002-2007 2009 2011-2018 YZ426F 2002 YZ450F 2003-2007 2009 2011-2015 2017 YZ450FX 2016-2018