Thank you for viewing! This is a surgical stainless steel (304) padlock m ম্যানtel necklace. Surgical stainless steel, such as 316L, 304, and 202, is a low-allergen material also used in medical tools like 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. Sizes: Total length including fittings: 38cm (choker type) Total length including fittings: 43cm Total length including fittings: 48cm Please specify your desired size after purchase. If no size is specified, we will send the 38cm size. Thank you for your understanding. Chain: 4mm x 12mm Padlock: 23mm x 15mm Material: All surgical stainless steel (304) Color: Silver Please feel free to ask any questions.