Color: Black Material: Plastic Tracking Parameters Size: 4.5cm x 1 x 78cm/piece (about 100 sections) Roller Wheel Parameters Size: 50 x 35mm (approx.) Aperture: Drive Wheel Color: Gray Size: 50 x 33mm (approx.) Aperture: M3 Package Contents: 4 x Plastic Load Wheels 2 x Plastic Drive Wheel 2 x Hexagon Wrench 4 x Screw Washers 2 x Track Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing thing. The measurement allowed error is +/- 1-3 cm.