These are the ones I bought - and I notice they are £14 per 100 and not £18 as in the FS post, which I will correct forthwith -
http://connaughtshaving.com/_wp_generated/wp3102dcec.png
There is an actual blade covering part of the carton which clearly states, " For Industrial Use Only" on the bottom of the printed picture of a blade and, "INDUSTRIAL BLADES" after the "100 SINGLE EDGE" at the bottom of the photo.
I'm not doubting for a second that these are the blades all you SE shavers use. I find them industrial on my face, is all.
I am most interested to learn from members resident in The Land Of The Free about another Gem blade.