Thank you for viewing! This is an X-link chain bracelet made of surgical stainless steel (304). Surgical stainless steel, including 316L, 304, and 202, is a low-allergen material used in medical tools such as scalpels and scissors, as well as in luxury watches. It is a special type of stainless steel with excellent properties, including resistance to rust, corrosion, oxidation, and heat. Sizes (Inner Circumference) S Size: 15cm M Size: 17cm L Size: 19cm LL Size: 21cm (Example: If your wrist circumference is between 16.5cm and 17.5cm, the M size (17cm) would be the appropriate size.) Please specify your desired size after purchase. If no size is specified, the M size will be sent. Please understand. The above sizes are not the total length. X-link chain: 7mm x 13mm Material: Surgical Stainless Steel (304) Color: Silver Please feel free to ask any questions.