Thank you for viewing. This is a leather bracelet with a surgical stainless steel (304) clasp. 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 and highly resistant to corrosion, oxidation, and heat. Unisex Materials: Leather (genuine cowhide) Clasp, Spacer: Surgical stainless steel (304) Sizes: Total length approx. 18cm (fits wrists around 16cm) Total length approx. 20cm (fits wrists around 18cm) Total length approx. 22cm (fits wrists around 20cm) Total length approx. 24cm (fits wrists around 22cm) (Example: If your wrist is between 15.5cm and 16.5cm, the 18cm total length will fit.) Please specify your size after purchase. If no size is specified, we will send the 20cm total length. Please understand. Leather: 2mm Please feel free to ask any questions.