OK, I'm confused by Manners website as I know nothing about their stocks (so please be gentle laugh ). The MCS-SL is listed as having a 100% carbon fiber shell, and then in their online order they have an $85 90% carbon fiber option. What does this mean?

If one were to go through their stock configurator, and chose the MCS-SL ($495), the 90% carbon fiber ($85), and two studs ($13) the total would be the $593 from above. Is the 90% carbon fiber option not really an option on the MCS-SL?