Build the ultimate ball track with this new SmartMax magnetic construction set that contains an amazing 74 pieces! With so many options you can build all kinds of structures and let the balls roll. Mega Ball Run contains special parts including tubes and X-shaped bars with 4 magnetic ends. All parts can be combined with all existing SMARTMAX. sets, creating an endless range of possibilities. SmartMax enables young children to explore magnetism safely, with strong, oversized pieces that are specifically designed for handling by young kids. At the same time, older children will have fun using the pieces to construct towers, bridges and countless other creations. SmartMax magnets are strong enough to carry up to 60 times their weight! Recommended for ages 3 years and older.