K'Nex 17023 Imagine Dune Buggy Set-40 PiecesKIDS CONSTRUCTION TOY: Using 325 classic style K'NEX pieces and a wind up spring motor, get a move on and create tons of cool, interactive models with this kids building set, from a Pirate Ship Ride, a Turbo Race Car, a Helicopter and more EDUCATIONAL TOY: This engineering set includes 25 different moving 3D building ideas and encourages the development of fine motor skills, dexterity, spatial awareness and problem solving using the colour coded rods