The MAGNALINX MED+RAP is comprised of 60 individual magnets.  It can be adjusted to fit any size wrist up to 9 1/2" by just removing individual magnets.  The individual magnets are 10mm (.4 inches) in height and have a power rating 6,000 Gauss (gauss is how you measure a magnets strength) each.  The BLACK finish offered above is one of our most popular designs for teenagers and hipsters.  If you're looking to create your own designs, we think it looks best when combined with SILVER or GUNMETAL MED+RAP finishes.