99-06 YAMAHA TTR250: Wiseco Pro-Lite 4-Stroke Piston (.060 Oversize) Wiseco leads the performance aftermarket by producing the highest quality forged pistons in the U.S.A. Wiseco is unique because they forge all of their own pistons in-house, and produce all of their own forge tooling in the U.S.A. This allows Wiseco to control all aspects of their manufacturing process from raw bar to skirt coating on the finished parts. Much stronger than stock. Forged using the highest quality materials available resulting in a piston that provides excellent performance and durability.