Students can construct, examine and explain simple machines to develop a deeper understanding of how they make work easier. Contains enough pieces to build a lever, pulley, inclined plane, wheel and axle, and wedge - A 5-in-1 value! Modify machines with 4 included weights and 8 included rubber bands to explore effort, force, load, motion and distance. Includes Activity Guide. Largest models measure 5½"L x 5½"W x 12"H. Grades 5 and up.