Purchased last year and only tried on. The following is quoted from the official website: The material used is surgical stainless steel 316L, so it is resistant to sweat and water, and you can wear it in the bath or during sports without any problems. It is also a material with extremely low allergenicity, so those with metal allergies can use it. (Individual differences apply.) Size: Approximately 31mm (length) / Approximately 18mm (width) Weight: 11.55g (both ears) Color: Gold Although it has only been tried on, it is still a used item and has been stored at a private residence, so please refrain from purchasing if you are sensitive to such things.