Wonderworld Creative Gravity Play! Trix Tracks Power Booster - 42 Piece Set Unique Kids Toy with Endless Building Options Unique brick locking system Durable bricks made from recycled plastic and sawdust Ball runs UP the tracks, not down Promotes intellect & skills, creativity & concentration, imagination & originality Eco-Friendly: Made in Thailand from sustainable Rubber-wood and strictly using Non-Toxic Paints, Dyes and Lacquers and Formaldehyde Free Glue