Create a large swooping rollercoaster with 27 feet of track. Send marbles racing through the course. Includes 4 marbles and detailed instruction booklet. A truly unique marble run! Watch the marbles accelerate down steep slopes, climb uphill almost to a stop, roll quietly along flat plateaus, before racing down another chilling plunge at full speed. Ideal for demonstrating principles like velocity, acceleration, gravity & friction. Includes marbles of 2 different diameters and weights to experiment the effect of physics forces along the track. Contents include: 25 pillars, 24 joints, 18 supports and junctions, 36 track connectors, 6 base pieces, 8 marbles, 12 curved tracks 20 straight tracks, 1 instruction manual with examples. Quercetti has been creating and manufacturing educational toys in itally for 65 years. Quercetti has contributed to generations of children engaging in beneficial play that encourages creativity and stimulates intuitive reasoning.