Specifically designed around use with the popular Hyper 7.1/18th off road buggy. Heavy duty moulded construction that houses two large 775 motors for extra torque amd power needed for turning over big block engines. Moulded cradles for two 7.2v stick pack batteries supplied. Front mounted switch to save power when not in use. Internal drive pre-assembled. Will also fit other 1/8th buggies with small modifications.