This is a Twin Motor Gearbox Assembly Set from Tamiya. This is a ready to assemble gearbox that uses two electric motors to independently control each of the output shafts. The gears and gear case are accurately molded from tough plastic for smooth and efficient operation. Two gear ratios, 207:1 or 58:1 can be selected. Includes two electric motors. Pictorial instruction sheet included. One Twin Motor Gearbox Assembly Set. Assembly Phillips Screwdriver Side Cutter Hobby Knife Adult Supervision Keep away from children under 3 years of age due to choking hazard. sdw 4/25/01 ir/jl &