Lyndall's full-floating, High-Carbon Steel rotors are CNC machined to exacting tolerances right here in the USA. Lyndall rotors are meticulously designed and thoroughly tested to ensure maximum performance in the most extreme environments and conditions known to powersports. Lyndall is so confident in their choice of design, materials and method of manufacturing that they guarantee their rotors for the life of your bike (when used exclusively with Lyndall premium quality organic brake pads.)