Purchased on Mercari, item only. No instructions or anything. I bought it thinking it was gold from the pictures, but it was silver, so I'm listing it. I borrowed the seller's description: "I saw an advertisement in the newspaper and bought it for weight loss and stiff shoulders. It has a matte titanium finish that suppresses shine. You can bathe with it on. Length 40cm (48cm including the chain) Thickness: Approximately 1cm It cost over 30,000 yen." It is a used item, so please refrain from purchasing if you are looking for perfection. Thank you.