Salt Crusher is a great educational science kit powered by saltwater. Equipped with four-wheel drive mechanical construction it easily handles different types of terrain by its twisted car body design. The transparent case design allows children to see; the rhythm of the piston in a vertical or horizontal direction. Change the Salt Crusher's height and shape and enjoy its unique way of moving. For ages 8 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.