This is the Fixing Ball For Rear Suspension For the HPI Racing Trophy Buggy Steel construction Four balls This ball can be installed on 1/8 Trophy 3.5 Buggy Nitro 2.4GHz RTR (HPID7012) 1/8 Trophy Buggy Flux 2.4GHz RTR (HPID7016) 6/14/12 pjw ir/jxs &