Copper Wristband with Magnets helps ease aching joints. According to Chinese medicine copper and magnets help rebalance energy and relieve pain. This well-crafted wrist band is superior to most copper bracelets because it is made of 99.99 pure copper. It has some flexibility for a comfortable fit, and looks great on men and women. There is a 1700 gauss rust-proof magnet in each tip of the band. To determine the best size, place your wrist on a ruler with the palm turned up. S/M will fit wrists that measure up to 2¼” across; L-XL for wrists that measure 2 ¾” across or more.