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And there are these things called 'jimps'. They are grooves cut across the tang where your fingers grip the razor. Some have them on the bottom of the tang, some have them top and bottom, and some...

The one you are most comfortable with is the best one for you. As has been said, 5/8 and 6/8 are the most common and there is probably a reason for that. Smaller razors are more difficult for me to...