HAPE TOTALLY AMAZING ROLLER DERBY - WOODEN MARBLE RACING TOY - Colorful wooden balls, peek-a-boo holes and fast tracks create a 2-sided mountain of fun. Encourages parents to talk with their children about the different concepts (fast, slow, back and forth) as the balls rolls down the tracks. Learn About Momentum, Color and Patterns: Discover the joy of guiding objects along the tracks (fast, slow, backwards and forwards). As your child gets older, tell them how gravitational energy turns into momentum. Inspire them to explore by themselves. Double The Fun With 2 Sides: Each side has different tracks, doubling the fun. The Bell Adds Fun: The bell on the bottom rings when the ball reaches the end of the track. Rounded Edges: Well-polished surfaces, round edges and sturdy materials ensure safe play. Easy To Carry: The Peek-a-Boo hole on the top doubles as a carrying handle, making it easy to take out and tidy away. Durable Wood, Water Based Paint: The durable, child-safe paint finish and solid wood construction make this a toy that your child will love for years to come.