The first step to great handling and predictability is selecting proper spring rates. With over 500 Hi-Performance Springs to choose from, Race Tech is almost guaranteed to have the spring you need. Stock bikes are generally under-sprung for the average rider, causing the bike to be unbalanced and unpredictable. High quality. These springs are made from chrome silicon wire. High stiffness to mass ratio. Shot-peened and heat treated for durability. These are the finest springs available! Accurate rates. No sacking-out. Sold as a set.