This keychain is laser cut from .125″/3.175mm thick 304 Stainless Steel. This is a very high quality, non magnetic, non corrosive and unbreakable material that should last a lifetime.
The diameter of the circle portion is around 42mm and the height is around 51mm with the keyring hole. The design is laser engraved on both sides and it comes with a 1″/25mm keyring.