Nexx Racing's Optional/Replacement DISK DAMPER SET for Lexan GT and Pan car bodies...Multi Length, plastic disk, (4) sets of tuning springs, carbon damper plate with body post extensions and hardware for MR02 & MR03 to make your box stock chassis into a real high performance, tunable racing platform. With the addition of a tunable, top, adjustable damper shock...example: NX-132...you will also be able to adjust the "droop" rear ride height and adjust the chassis's "roll rate" to increase corner entry and exit speed. Building speed is cool!