Roll, CLUNK, discover! The gradually widening track propels the balls forward fast until suddenly they drop, perfectly, gracefully into their matching colored slots. Meanwhile, fine motor skills are bolstered and an understanding of size and color is fortified - Plus, the balls all have built-in rattles for an extra twist of sensory fun! Simple fascination inspires hours of exploration with the RollAgain Sorter. RollAgain Sorter An innovative twist on the classic fun of size sorting Encourages fine motor skills, sorting skills, sequencing, exploration, experimentation Simple yet powerfully intriguing Widening track propels balls forward Balls feature built-in rattles for extra sensory excitement Balls naturally drop directly into their matching slots Includes sorter, 4 balls High quality materials and construction - Lasting durability and safety