The goldvalve kit has everything you need to revalve the WR250R rear shock. Instructions are clear and you can set it up for your individual age, weight, and riding style. This revalve performs better than the most popular revalving company's revalve that you send the shock in to. (I had a WR250r with that company's revalve). The price is less too as you can do it yourself...plus if you find you want to change the action, you have the extra shims, charts, and knowledge to do so.