RPM accuracy is the key to a proper suspension setup. With the stock spring collars, there is no way of knowing if one shock is set up similar to the next. With RPM's clips, all the guess work is removed and accuracy becomes as close to perfect as you can get! The set includes four spring collars that mount on top of each spring to prevent the spring from rubbing the shock body, and a full set (4 ea.) of four different thickness clips that snap around the shock body, effectively eliminating the need for shock collars!