ITEM NAME:DIY Tank Accessories Set of 40 Section Tank Track Conveyor and Drive Wheels - img *{margin:0;padding:0;.Perfect for All Smart Tank Chasis, and shock absorption designed. Stardard 40 Section Tread. Driving Wheel: approx. 1 Piece Driving Wheel. Drive Wheel: approx. 1 Piece Drive Wheel. 1 Piece Motor. Material: Plastic.