Yeah Racing QUTUS Slider 55mm Damper Set for 1/10 RC Drift Car #DBB-1055 Yeah Racing new generation of Dampers, the Qutus (Quick Tuning System) allows for you to adjust the damper action without taking the damper apart and having to change oil! Build with the included adjustable pistons to quickly change how much dampening you require. Choice from 1 to 5 holes open in the piston will allow you to tune the damper matching to your track conditions. The D-Bore features drift tuned springs in both soft and hard variations, perfect for drifting on low and high grip surfaces.If adjustable pistons aren't your thing, traditional "fixed" pistons are also included in two, three and four hole variants. The shock body has been updated to be of "big-bore" spec. which fills more oil than traditional dampers which gives much more consistent handling in both cold and hot temperatures. Soft, Medium and Hard springs have been included as well. Quick Hydraulic Tune System 4, 6 Stages Of Adjustment Or 3 Different Fixed Pistons CNC Machined Selected Anti-Leak O-Ring Aluminum Damper Cylinder Easy To Refill Damper Oil Simple Installation Big Bore QUTUS Dampers (4 pcs) Adjustable Pistons (8 pcs) Fixed Pistons (8 pcs) Hard Springs (4 pcs) Soft Springs (4 pcs) *Photos for reference only.