The M5 Shap = 5mm thick. It is the cheaper non pro version of the 10mm full size Pro but for the home kitchen etc. It is bonded to a ceramic tile base. Don't use that side :p
It works the same on razors. A crispy stubble destroying edge that takes very little to be tamed on pastes but may still be a bit to much for those with sensitive skin. Perfect followed by the 20k Gok.