Both Schick and Gillette made 3pc and TTO DE's with deeply marked top caps. Can't say I'm a fan of the style. Those with open comb caps look interesting but I haven't tried one yet. That would be interesting. Gem blades - stiff with the thick wrapped end lay flat. I can't think of a DE that doesn't bend the blade in at least a slight curve. I'm not sure how one set up could hold both types of blades.