ELKA Stage 2 IFP center skid shock for REV GEN4 Sumiit 2017-18. This is a great shock without breaking the bank and preload and rebound adjustment. These are the highest quality with superior valving and components to last for years of service. We stock most of these for 200 pound riders and the preload is easily adjustable in just a couple minutes. These include both shock and sprins and install easily in 20 minutes or less.