Genuine spark plugs for the zc33s. This is a set of 4. I've replaced them with racing plugs and won't be using these anymore, so I'm selling them. They were used for about 9,000 kilometers over a year. They still have plenty of life left! For those who are sticking with the stock specifications and not planning to tune, how about these? Thank you! They will be shipped in the box of the racing plugs I replaced them with. The contents are the genuine products shown in the photos, so please be aware of that.