Use this new SMARTMAX® STEM-focused magnetic construction set to create amazing structures! SmartMax Build & Roll includes 44 pieces that enable kids to make all kinds of crazy structures and let the balls roll...and then pack everything in a sturdy storage case! Includes 15 bars, 7 curved tubes, 2 straight tubes, 1 funnel, 12 metal balls, 7 panels with holes and a building guide. SmartMax enables young children to explore magnetism safely, with strong, oversize 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!