Kit includes head, base, side cover and exhaust gasket to rebuild the top end of your Polaris 400/425/450 four stroke motor. Even includes the valve seals! Don't ever re-use old gaskets when rebuilding your engine! High quality non-asbestos materials are used in kit. Includes all of the following top end gaskets shown in the photo including: Head Gasket Base Gasket Valve Cover Gasket Exhaust Gasket Cam Cover Gasket Water Outlet Gasket Valve Seals (4) Camshaft Adapter O-ring This gasket kit fits the following models: 1995-00 Polaris 425 1995-98 Magnum 425 2001-05 Sportsman 400 2006-07 Sportsman 450 2000-02 Xpedition 425