The ShockStop Elastomer Kit provides a set of replacement elastomers for the Redshift ShockStop Suspension Stem. These bike suspension stem elastomers will perfectly tune your Redshift ShockStop Stem and make it feel like new again. You get a pack of 6 durometer elastomers in each kit that are compatible with 55mm and 70mm stems only. The elastomers should last for several years, but the exact lifespan will depend heavily on the use and surrounding conditions. Please note, there will be a slight "breaking-in" or softening of the suspension feel which will stabilize as the elastomers settle in place. These elastomers are only compatible with the 55mm and 70mm ShockStop Stems. They are not compatible with any other products.