MA-020VE PRO SP Chassis Set Tweet Description Battery Type: Transmitter: AAA Battery x 4 (sold separately) / For Running: AAA Battery (alkaline or Ni-MH) x 4 (sold separately) [Set Contents] -RC unit built-in complete chassis -Pinion gear (15T, 17T, 19T, 21T) -Wheelbase changing parts -Thread changing parts -Rear long suspension changing parts -Pinion removing tool -Spare nut -Wheel wrench -Super fear wheelbase M/L/LL (each 27T/29T/31T)