SE blades are thicker than DE blades, far more rigid and have a great cutting edge that will outlast most DE blades, you not only have the Gem bladed SE razors but also the AC type wide SE razors and although there is not as much choice in blades as DEs there is still a wide choice of these AC style SE blades and not to forget injector razors that are of course SE razors, again a thicker more rigid blade that can give around 10 or more shaves before they need changing.I was wondering why a SE razor over a DE razor. For a start, it seems that the blade choice is not so big.