The K'NEX Mario Kart Wii Mario Circuit Ultimate Building Set is a plastic building set featuring characters from the Nintendo Mario Kart Wii game. With 665 pieces, this set allows children aged 6 and up to create their own Mario Kart racing tracks and playsets. The set includes characters like Mario and Toad, and is themed around racing, making it an exciting and engaging toy for young builders and gamers alike. Made in the United States by the K'NEX brand, this set offers endless creative possibilities for children to enjoy.