DURABLE, CHILD-FRIENDLY MATERIALS: BPA-free, lead-free ABS plastic and smooth edges support everyday building, while durable magnets and weighted balls keep each magnet tile marble run ready for repeated experiments. MARBLE RUN STEM LEARNING IN ACTION: This magnetic tile marble run turns gravity, motion, and cause and effect into hands-on discovery as kids design layered raceways with slopes, funnels, turns, and rolling challenges. EXPANDABLE, VERSATILE PLAY: Use the PicassoTiles marble run set on its own or combine it with other full-size PicassoTiles collections to create taller tracks, castles, vehicles, and imaginative multi-level structures.