WOSSNER YAMAHA TY250 MONO PISTON KIT (4 SIZES)Wossner forged pistons are superior in strength and design. Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. Elliptically designed to provide a more uniform bearing surface under piston heat expansion, eliminating localized pressure and distributing thrust loads more evenly, thereby preventing piston collapse. Made in Germany. Kit comes with: 1x piston (available in 4 sizes 68mm standard, 68. 5mm,