ITEM NAME:2Pcs Plastic Tire Wheel with Gear Motor Dual Shaft for Smart Car Robot Ardu A4Z5 2Pcs Plastic Tire Wheel with Gear Motor Dual Shaft for Smart Car Robot Ardu A4Z5 it has an anti-interference ability Operating Voltage: 3V~6V DC Recommended Operating Voltage: about 3 to 6V DC External Diameter of Tire: 65mm/ 2.56 inches; Inner Diameter of Tire: 28mm/ 1.10 inches Weight of Tire: 1.26ounces color:yellow Material: plastic Package Includes: 2x Gear Motor 2x Tire Wheel Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.