Sometime simpler is better!  Economical magnets in a basic bar shape feature an opposite pole on each end, creating an interesting arc-shaped magnetic field to explore.  Ideal for activities that do NOT require a lot of lifting power.  Two color-coded plastic encased ceramic bar magnets. 

Learn all about magnetic polarity! Plastic encased ceramic magnets, each 3" tall. Color coded to indicate North and South poles. Ages 3+