Kit includes all the gaskets and seals to completely rebuild the engine of your Polaris 250 two stroke. 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 gaskets and seals shown in the photo including: Head Gasket Base Gasket Intake Boot O-ring Exhaust Gasket Starter Gasket PTO Oil Seal Mag Oil Seal This gasket kit fits the following models: 1990-2006 Trailblazer 250 1989-92 Trailboss 250 1989-92 Big Boss 250 2000-02 Xplorer 250