3,447 pieces to build 60 models for hands-on experience with the fundamental design and work performed by each type and class of machine. Models demonstrate lever classes, pulley and wheel and axle systems, gear configurations, and inclined wedges and screws. Parts and instructions for the 1.5m (5’) tall Big Ball Factory and 12 volt motor included. Supports 2 to 12 students working as teams. One teacher guide for each simple machine concept is included, plus bonus instructions for complex machine team project (a 4’ tall Rube Goldberg device). Comes with plastic storage tub.