The ball connectors which serve as damper attachment points in many of Tamiya's cars are subjected to large stresses during driving that they may deform. These ball connectors are made from a more durable type of aluminum and also feature a low-friction coating to ensure smooth suspension movement. Specs & Features Ball Connector x 4 Can be used with cars equipped with TRF dampers attached onto carbon damper stays (e.g. TRF417X)