Build all 5 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. A 5-in-1 value! Contains enough pieces to build a lever, pulley, inclined plane, wheel and axle, and wedge—all at the same time. Modify machines with 4 included weights (two 5g and two 10 g) and 8 included rubber bands to explore effort, force, load, motion and distance. Labeled pieces assemble easily and separate to store. Set of 63 pieces includes Activity Guide. Largest models (pulley and inclined plane) measure 5 ½”W x 12”H. Ages 9-12.