This is a miniature keyholder of a Heisei-retro deodorizing plug. It's a rare item from about 25 to 30 years ago. Measured by a layman, it's 2.8cm, please understand that there may be some errors due to amateur measurements. Please check the images as it has been stored for a long time. I have kept it carefully. Please refrain from purchasing if you are nervous, and please purchase only if you understand. Instant purchase is OK.