Looking for an educational toy that helps your kids on their gross motor skills, as well as understanding the concept of gravity? Why not, try this popular toy Slinky! Be fascinated by the metal spring which can perform a number of tricks with the aid of gravity! This learning toy, metal slinky, can also be used to teach kids about potential to kinetic energy. When your kid place the metal slinky at the top of the stairs, see how the metal springs tumbles coil by coil down the steps. Such a cool Science experiment. Age appropriate for 7 years old and up.