The Quadrilla Whirlpool takes twists and turns to a new level. A large spiraling funnel, 5 curved precision crafted birch rails and 8 power boosting accelerators encourage young builders to design and re-design gravity defying marble runs. Great on its own but can also be expanded with other Quadrilla sets and accessory pieces.Quadrilla marble runs offer a world of unlimited possibilities for 3-dimensional thinking, creativity and technical understanding for young and old. Watch the marbles drop from one rail to the next making a fascinating sound as it races down the track. All marble run sets are extendable and combinable.The Quadrilla Whirlpool set includes 51 wooden piece's 50 marbles and an idea filled manual. A timeless, award winning educational toy that will provide entertainment for the whole family.Features : 19 coloured blocks 10 height adjusters 7 base rings 13 connectors 1 twist rail 5 curved rails 50 marbles 1 cloth storage bag The Quadrilla Whirlpool will make a fantastic gift for any child. An idea filled manual 5 curved precision crafted birch rails and 8 power boosting accelerators Can also be expanded with other Quadrilla sets and accessory pieces.Suitable for ages 4+ but is so much fun for children of all ages.