This is a black-dye finished release button S made by nanigashi, machined from solid brass using a lathe. The black-dye oxidation treatment creates a colored finish that wears away with use, revealing the brass underneath. (Excerpt from the HP) As stated, the black coating is currently wearing thin, and the brass is visible. (Please refer to the photos.) Size / S: φ11 x h2.6 mm (h5.0 including the threaded part) Finishes / Bare, Black (Black Dye), Silver (Urushi Lacquer) Maker / Ichiryo Kinzoku, Iro-Masa https://nanigashi.thebase.in/items/9974254 ■ Regarding Purchase Please refrain from purchasing if you are looking for perfection or are overly sensitive. Please consider this item if you understand that it is a used item. ■ Packaging and Shipping Recycled materials will be used for cushioning and packaging. The color may appear different depending on the photo and lighting. Please purchase only if you understand that this item has been stored at home. Thank you for your understanding.