With this 63-piece kit, kids can build all five Simple Machines at the same time. Students can construct, examine, and explain simple machines to develop a deeper understanding of how they make work easier. The set contains enough pieces to build a lever, pulley, inclined plane, wheel and axle, and wedge. Children can modify the machines with four included weights (two 5g and two 10g) and eight included rubber bands to explore effort, force, load, motion and distance. The labeled pieces assemble easily and separate to store. An Activity Guide is included. Launch date: January 31, 2008.