This is the 20th Anniversary Style Classic Balance Bracelet made by Rayma. The Memriflex band is made of twisted German surgical stainless steel so they are flexible making it easier and comfortable putting it on and taking it off. The two spheres are coated with 9 microns of 18 and 24 karat gold. Men and women wear this Balance Bracelet. This makes a great gift for the active person. Medium size is good for a 7 to 7 3/4 inches size wrist.