These cords are strong, waxed polyester string called Linhasita. It is extremely durable, water/sweat resistant, washable, and comfortable to wear. The bracelet is finished with a macrame slip knot, which allows for various wrist and hand sizes. All jewelry begins with just a cord and stone, the rest is macrame "knotted" cord manipulated to create unique designs. Each piece is one-of-a-kind and designed to enhance the features of the stone.