4WD Suspension Smart Car Chassis with BO Motors Kit is best for beginners as well as regular users. This is a very creative design that looks like any NASA project bot. The 4WD Smart Car Chassis kit is easy to use as it has all the mounting holes and assembly. This smart car chassis comes with a battery holder for providing power to bo motor. It has a same-size mounting hole for Arduino and Raspberry Pi and Motor drivers. 4WD Smart Car Chassis is very Easy to Assemble High-Quality Laser cut Acrylic Plates High Quality Wheels and BO Motors with Dual Straight Shaft Precise Nut-bolts and Spacers Package Included: 1 x 4WD Smart Car Chassis 4WD Suspension Smart Car Chassis with BO Motors Kit