X-Bar Translucent Magnetic Bars and Steel Spheres, 55 Piece Complete Transportation Set 55 pieces total: 11 bars, 6 metal balls, 38 transportation accessories Develop creativity, imagination, mathematical, and scientific thinking Build various magnetic trucks, loaders, scoop truck, trains, helicopter, and jet planes for hours of fun High resistance pc plastic which will not break or crack, pa free plastic comes in 6 bright colors Patented cogwheel structure allows stronger binding strength compared to other leading competitors' products