The Hornet Wave keeps you out there at your best. Designed for performance.Using Lightweight induction hardened stainless steel the Hornet Wave discs 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: 270mmI.D: 118mmMinimum Thickness: 2.5mmRotor Position: Front Fits: Yamaha WR250F 2017-2021 WR450F 2016-2021 WR450FSP 2021 YZ125 2017-2020 YZ125X 2020-2021 YZ250 2017-2020 YZ250F 2016-2020 YZ250FX 2017 2019-2021 YZ250X 2017 2019-2021 YZ450F 2017-2019 YZ450FX 2016-2021