ClickBlock X-Bar Magnetic Building Construction Toy Super Set, 48 Piece 48 pieces total: 24 bars, 16 metal balls, 8 curved bars and colorful builder's guide for model ideas Develop creativity, imagination, mathematical and scientific thinking Build geometric shapes, towers, bridges, words, house and multiple structures Patented cogwheel structure (U.S. patent pending) allowing stronger binding strength compared to other leading competitors' products Keep collecting x-bar, you can build tower over six feet tall