2WD 3 Wheel Robotic Smart Car Chassis (Economy )

Trolley two wheels and wheel center spacing 130MM. 
Outside of the car on two wheels distance 150MM 

 Shipping list: 
Car chassis 1 
Car Wheels 2 
DC Gear Motor 2 48: a deceleration 
20 line gun code disk 2 
Fasteners (high intensity black acrylic) 4 
front ball Caster 1 
Four battery box 1 
Quality Rocker Switch 1 
Assembly drawing 1
Several screw nut