Very disappointed. The advertised picture shows an original Denso type plug with words including "Japan" engraved around the metal collar of the plug along with blue painted lines to indicate Japanese origin. These plugs have "Assembled in the US with Foreign Parts" engraved around them with no blue lines which could mean made in Russia, China, India, or ???. The plugs were packaged poorly; just a brown envelope to where the plugs were falling out of their boxes and poured out in one big mess. I gave three stars for the expedient delivery and no broken plugs. I've read too many stories about possible counterfeit plugs, so I returned them. Still trying to figure out how to get official "Made in Japan" plugs for quality assurance sake, but realize counterfeiters can put those markings on them as well :(