This is a bumper class set to teach the principles of magnetism. Yellow blocks attract blue blocks and like colours repel. Children can easily create vehicles and add drivers to their constructions. Each cube measures 5cm cubed and the spherical and cylindrical parts are great shapes to add to a vehicle or construction model. This bumper 68 piece set contains: 20 cubes, 12 triangles, 8 wheels, 8 sphere parts, 8 cylinder parts and 12 people in a mixture of skin tones divided equally between adult and child pieces.