Cat Caterpillar Construction Mini Machine Dump Track Steamroller 5-Pack #34601 Five pack of free-wheeling mini CAT machines. Includes: Dump Truck, Bulldozer,Wheel Loader, Backhoe andRoad Compactor. Scaled to play with CAT Mini Machines and CAT Bridge and Mine Builder Playsets. No batteries Required. A complete construction site in a box, just add dirt