Thank you for viewing. This is a Figaro chain bracelet made of surgical stainless steel (316L). The clasp is a folding type. 316L, 304, and 202, known as surgical stainless steel, are low-allergen materials and are used in medical tools such as scalpels and scissors, as well as in high-end 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.