Polished stainless steel accents and stainless wire cable make this bracelet one of Sabonas most popular items! and, There is a 1200 gauss samarium cobalt magnet in each stainless steel ball. and, Sabona chooses Samarium Cobalt magnets for long term durability and rust resistant qualities. and, and, Sabona cuff-style bracelets fit better if they are snug. and, If the exact fit is not possible, the smaller size will be the best. and, Magnetic Bracelet sizes are Small (7.0) and Large (8.0).