Manufactured in Japan, this key holder has an organic appearance and texture that matures with use. This is a key ring made of solid brass, designed to look like an old railway tag with a luxurious finish. Variation: This key holder will patina over time, the appearance and texture will change with use. Measurement: 4cm Materials: Brass Care Instructions: Brass will naturally patina over time. Oil and air will naturally darken this piece and make it shinier. This is part of its natural beauty. Do not use chemicals to clean. If exposed to water or moisture for long periods of time, it may cause the metal to change color quicker or spot.