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Product description:A world of surprises awaits with this Deluxe Quadrilla Set. Includes a xylophone rail that plays a melody as the balls pass over, two two-sided spirals and four blocks to cast the balls at random.Get started by helping your children to build one of the circuits shown on the box. Drop the balls at the top of the tower and watch them play notes on the xylophone, spin through the spirals and make the swings rock. Next, use your imagination to build your own game tracks!Helps develop spatial thinking and understanding of the principles of Science, Technology, Engineering and Mathematics (STEM). Infinite possibilities of reconfiguring the layout. See the attached guide - Compatible with all Hape Quadrilla setsContents: 21 blocks, 15 height adjusters, 7 rings, 12 acceleration ramps, 5 perforated flaps, 3 large curved rails, 2 small curved rails, 1 S-shaped curved rail, 1 sheer block, 1 rotating tower, 2 sensors, 1 xylophone rail, 50 marbles, 2 double-sided spirals, 1 multifunction block, 2 red rocker blocks, 1 rocker block, 1 blue rocker block and 1 cotton bag • Age: From 4 years • Product: 3.72kg • Packaging : 52.5 x 9 x 48cm / 4.3kg