Three hardwood machines exploring different properties of physical science. The Fulcrum Balance allows children to move the weights on either side of the fulcrum to create balance, the Pendulum shows mass in different positions on the pendulum as it relates to timing and swing, and the Inclined Plane which allows changing force by changing the angle. The Pendulum is 15½" H. Includes Teacher's Guide with each simple machine. Set of 3. Ages 4 yrs. +.