Quadrilla
- Sound Block Extension Set Music in the key of Fun! Turn the Quadrilla Twist & Rail Set into a magical marble music maker with the Quadrilla Sound Block Extension Set from Manhattan Toy. Eight metal music makers run the scales (with an extra G thrown in for good measure!) & extra rails & accelerators geometrically increase the design possibilities. &, those hard working marbles can come to a soft rest in the two felt-lined catch trays at the end. When this 53-piece Quadrilla Sound Block Extension Set adds the sound of music to the speed of sound, the delightful sound of childrens' laughter can't be very far behind. Age: 4+