Watch the marble ride the curves, winding down the tracks with a pleasant click-clack The Curvy Click Clack toy features colorful tracks with speed bumps that keep the marbles on track. Grooves at the base hold the marbles. Designed by Plan Toys to help children develop fine motor, concentration and coordination skills, plus an understanding of visual relationships and cause and effect. Appropriate for children ages 3 and up. Made from ecofriendly, safe and sustainable PlanWood. Easy for an adult to assemble.