General description The 4Set Track + Drive Wheel/Bearing Tank Car Chassis Robot Wall Power Model Kit is designed for DIY enthusiasts and robotics projects. This kit includes essential components to build a functional tank car chassis, perfect for various applications. Technical specifications Color: Black (Track), Gray (Drive Wheel) Material: Plastic Tracking Parameters Size: 4.5cm x 1cm x 78cm per piece (approximately 100 sections) Roller Wheel Size: 50mm x 35mm (approximately) Drive Wheel Size: 50mm x 33mm (approximately) Aperture: M3 Measurement allowed error: +/- 1-3 cm Package contents 8 x Plastic Load Wheels 4 x Plastic Drive Wheels 4 x Hexagon Wrenches 8 x Screw Washers 4 x Tracks