Winderosa top end gasket sets are designed for a piston replacement, delivering best-in-class value by offering the right balance of price and performance. Includes every gasket, O-ring and seal required to rebuild a top end; valve seals, head, base, exhaust, and other Misc. Gaskets/O-rings (formed rubber valve cover gasket not included). constructed from quality materials that meet or exceed OEM specifications. Made in the USA. Fits: Yamaha YZ250 2002 - 2016, YZ250X 2016.