This 8,550-piece K'Nex Ferris Wheel will certainly test your building skills. Standing at over 6 feet high (1.8m), it's their largest model yet. Follow the colour-coded instructions to put it together, then connect it to the AC adapter supplied and watch it go round. The easy-to-follow instructions let you connect it a piece at a time, so you can build it in stages. It's a great way for teenagers to learn about design and engineering principles and will give you immense satisfaction when complete. Seeing it rotate round - perhaps filled with LEGO figurines - will be an impressive sight, especially with differently coloured rods and connectors. Made in Pennsylvania, USA, by a family-owned company. Includes: 8,550 K'Nex pieces, rods, connector; plug-in motor with AC adapter; full-colour instructions.