About this item:
The path-building pieces in our center stick to any magnetic surface…so it’s easy for kids to build, test, and reconfigure various pathways—sharpening STEM problem-solving skills as they create! The Center includes 150 foam balls, a ball cup, plus 11 translucent plastic pipes with funnels that give kids a clear view of the action.
 
The largest piece measures 5 3/4". 
Stand-Up Magnetic Design Center sold separately.