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! STEM LEARNING FUN: SmartMax Build XXL features colorful oversoze bars and metal balls for a super fun introduction to STEM concepts for young kids. With 70 pieces and a sturdy storage case, Build XXL is perfect for the home...and the classroom! ENGINEERING AND CREATIVITY: Designed for ages 3+, kids will be enthralled by the tactile process of clicking the bars and balls together. SmartMax magents can carry up to 60x their own weight...making extraordinary structures possible! SET INCLUDES: 70 colorful pieces with strong bars, metal balls and a sturdy case for storage. ENDLESS PLAY: All SmartMax sets are compatible with each other. Kids can start building...and keep building. QUALITY AND SAFETY: Award-winning SmartMax Magnetic Discovery sets are build with high quality materials, including sonically welded bars.