These new Super Nipple Magnet Balls are just that-- super. The pull on these is incredible! They are super strong and provide a constant pressure to the nipple... or wherever they are used.
Each set comes with 2 pairs (4 balls). 1/2" diameter balls.
As with any magnets, extra care should be taken so they are not swallowed, and they should be kept out of reach of pets and children.