This is a skill-building construction product that older children will enjoy. It is a 380 piece set that features a motorized elevator. The marbles are automatically brought to the top of the set to race down the track again. It features thirty feet of glow-in-the-dark track. The rails are suspended in mid-air through a series of ties and anchors - just like a real suspension bridge. Help build your child's imagination, finger dexterity and self-confidence with this product that includes a detailed instruction booklet. Your child will learn about gravity, speed, inertia, centrifugal force and other principles of mechanics and physics. This toy requires two "AA" batteries, not included.