The Knex Amazin' 8 Roller Coaster Building Set is a retired motorized building toy set featuring 448 interlocking blocks made of plastic. Suitable for ages 7 and up, this set allows kids to construct a roller coaster theme under the Amusement Parks category. With battery power, this set is part of the Kid K'NEX product line from the K'NEX brand. Perfect for young builders looking to create their own thrilling amusement park attractions. Box was partially opened so I opened it completely to make sure everything is there. For that reason I'm listing it as new open box, but the bags are unopened.