Simple Machines - Wheels, Axles & Planes

Kids use 221 pieces to build 7 real world examples of how a wheel turns an axle, how an axle turns a wheel, plus 2 levels of inclined plane, and a screw and a wedge. Each set supports a team of 2-3 students. All packed in strong storage trays with movable dividers and snap-on transparent lid. Includes a teacher's guide.