SmartMax Build XXL features 70 building pieces and a container that is a sturdy storage unit - and much more! Both the lid and the bottom of the container each offer a unique building grids to help you on your way to building original and colorful structures. Colorful building guides are also included. SmartMax enables young children to explore magnetism safely, with strong, oversized pieces that are specifically designed for handling by young kids. SmartMax products are safe and durable, made from the highest quality materials. Our magnets are incredibly strong, able to carry up to 60 times their own weight! SmartMax magnetic bars feature unique color codes: "Cold"-colored bars (blue, green, purple) attract "warm" colored bars (red, orange, yellow). Warm-colored bars repel other warm-colored bars, cold-colored bars repel other cold-colored bars. SmartMax products include complete, colorful guides with both product information and sample designs. All parts can be combined with all existing SmartMax sets, creating an endless range of possibilities!