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: 240mmI.D: 115mmMinimum Thickness: 3.5mmRotor Position: Front Fits: Yamaha YZ250F 2021 YZ250FSP 2021 YZ450F 2020-2021