Thank you for viewing. This is a Figaro chain bracelet made of surgical stainless steel (304). The clasp is a folding type. Surgical stainless steels such as 316L, 304, and 202 are low-allergen materials and are used in medical tools such as scalpels and scissors, as well as in luxury watches. They are special stainless steels with excellent properties, such as being rust-resistant and resistant to corrosion, oxidation, and heat. 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: 7mm Material: Surgical stainless steel, gold coating Please feel free to ask any questions.