Emilio here on TSR (forum name milogciachez) sells both these types, and many of us have bought from him in the past. I highly recommend both types - sharpish, very smooth and long-lasting. Both types have been replaced by a "Polsilver Super Iridium" blade of which I have one, but haven't yet tried it. I love Polsilvers in my Slim, and Iridiums in my Flare Tip Rocket.