Boyesen's Superstock Reed is purpose-built to offer superior airflow, and reactivity to throttle inputs while at the same time offering excellent durability for a price that costs less than any stock or aftermarket reed on the market. With tensions that match OEM specifications, the Superstock Series is the first step to achieving an improved air intake system. Superstock Reeds feature category-leading toughening additives to increase reed petal lifespan by resisting breakdown from damaging agents found in fuel. Superstock Reeds last longer and cost less than any stock or aftermarket replacement reed petal on the market. Fits: KDX200/220 all, Polaris ATV 2-stroke