The product type is 316L steel, it does not tarnish or rust. It does not tarnish or rust. It does not cause any fading or discoloration. It is suitable for all wrists with its 17 cm standard size and expandable size. In order for the products to be used for a longer time without losing their properties, it is recommended to use them by keeping them away from liquid chemicals such as perfume, water, detergent and disinfectant. It does not darken if used carefully. We hope you enjoy it in healthy and happy days.