DOIT 2pcs Metal Driving Wheel for Robot Tank Car Chassis, Action Wheel by Caterpillar Remote Control Toys Drive DIY toys kids Battery for controller: 4*AA(Not include)

Battery for controller: 4*AA(Not include)

Price default packaging method: bag

5V AA(Not included)

Width: 42mm/1

DOIT 2pcs Metal Driving Wheel for Robot Tank Car Chassis, Action Wheel by Caterpillar Remote Control Toys Drive DIY toys kids Battery for controller: 4*AA(Not include)The metal bearing wheel is made by aluminum alloy. It has two colors: silver and golden yellow. By using it, can conveniently install your loved tank chassis. Silver 4mm: means the color for the wheel is silver, and the inner size for the coupling of the wheel is 4mm to connect the motor. Silver 5mm: means the color for the wheel is silver, and the inner size for the coupling of the wheel is 5mm to connect the motor. Silver 6mm: means the color for