Black Metal Mini Bov Blow Off Valve Keychain Key Ring/Chain For Car/Truck/Suv C Item is real metal for a high quality lasting part. This listing is for one Blow off valve keychain as seen in picture. Item is real metal for a high quality lasting part. Dimension for the BOV ( 40mm (1.5") tall x 35mm (1.4")wide). Weighs in at 1.5 ounces.