Resin wristbands are made of premium resin and rose gold hardware. Each piece of resin was slowly polished to perfection. In comparison to stainless steel, resin materials are not only lightweight but also more durable, stronger, and avoid fading. They are water resistant: in general-suitable for washing hands; swimming and snorkeling, but not scuba diving. Fits the size of wrist: 5"-7.8" wrist. However, it is adjustable for size at both ends. Just use a standard eyeglass tool kit to remove the pins and sections to adjust the width!