Personna Crystal is the blade I use in my Rockwell 6S razor. I always get a close shave with this blade. It's not the sharpest blade on the market, but sharpness isn't everything. As with almost every DE blade I've tried, the Crystal will definitely become smoother, maybe a little sharper, after the first use. I have found that I can use one of these blades for six shaves and then throw them away. I don't know if I can make more than six razors from a single blade, but I use a hex cube to keep track of how many razors I have on a blade, and if I can get six razors from a blade, I am happy.
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