This is a separate extension adjuster chain made of skin-friendly surgical stainless steel. Surgical stainless steel is the same material used for scalpels and scissors in surgery, so there is no worry of discoloration, rust, or metal allergies. The color is the natural silver color of stainless steel without any plating or other processing. You can extend your necklace by 7cm. It also helps to prevent the necklace clasp from rotating to the front. Depending on the size, you may be able to use a bracelet as an anklet. The end is stamped with "surgical stainless steel". This is the price for one piece. Size: Total length approximately 82mm (including the end charm) No comments, immediate purchase OK.