advance's website is horrible. The descriptions and details are horrible. For all we know that could be for 100 of them, or could be a mistake. I like to use the website because then you can use the discount codes but it's really hard to find some things and once you find them a lot of the time you don't know exactly what you are getting due to the poor description.
Its made of this new fangled metal called maximusferrous. Some very exotic trick material that only a select few companies can obtain. (You can guess what companies have access to this metal). Just make sure to use the correct lube when installing other wise it may hurt.
Josh
I just bought 4. They are far superior to stock in terms of looks, and performance. I would recommend them to anyone. Nah J/k I'll stick with the stock plug thanks.