Thank you for viewing. This is a Figaro chain bracelet made of surgical stainless steel (316L). The clasp is a fold-over type. 316L, 304, and 202, known as surgical stainless steel, are low-allergen materials also used in medical tools such as scalpels and scissors, as well as luxury watches. It is a special stainless steel with excellent properties, such as being rust-resistant, corrosion-resistant, oxidation-resistant, and heat-resistant. Unisex (for both men and women) Sizes: Wrist Circumference (Inner Diameter) 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 size after purchase. If no size is specified, we will send the M size. Please understand. The above sizes are not the total length. Chain Width: 5mm Material: Surgical Stainless Steel Please feel free to ask any questions.