It used a 37mm main gun

which is comprised of radial ribs that lock the wheel and foam insert together

-Pb Battery Voltage: 6 - 12 Volts

III Azure and Nero both feature stylish fresh features

Exotek Racing - Rock Baja Rey Alloy Differential Gear Case with HD Screws Electric Accessories Battery Leads It used a 37mm mainHeavy duty diff gear case for the front, middle or rear Losi Rock or Baja Rey gear box. Includes bigger than stock steel diff screws to prevent blowing out the gear diff under heavy loads. Screws requires a quality 1. 5 hobby grade hex wrench (do not use allen keys). Losi Rey gear diff is required. For experienced hobbyists.