Have fun exploring magnetism safely and building incredible structures with SmartMax Start XL! The oversized pieces are specifically designed for handling by young kids as they learn about the effects of magnetic attraction and repulsion, while older children will have fun using the pieces to construct towers, bridges, and other creations. The magnets are strong enough to carry up to 60 times their weight! Extension sets are available separately. Size: SmartMax Magnetic Set, 42 peices. Color: Multicolor. Gender: unisex.