JR MASS DAMPER SET DESCRIPTION This Mass Damper Set features heavier weights than standard sets that are available. The heavier set is great for improved damping after landing from big jumps. It’s also great for circuits with lots of airtime! Mass dampers are resonant devices used to suppress or absorb vibration. When installed properly on a Mini 4WD machine, they draw away vibrational energy from the machine and dissipate it internally; reducing the motion of the car and helping it maintain speed and cornering efficiency. • Weights (Silver) x 2pcs. • Ball Caps (Green) x 2pcs. • 2x30mm Screws x 3pcs. • Spacers, washers, and nuts also included. • Compatible with any Mini 4WD or Mini 4WD PRO car.