A Feather with attitude
I bought these to give them a try in a Mongoose SE razor as well as an Artist Club RG. They are simply superb in the Mongoose, where the tiny amount of additional blade exposure really clears the whiskers without a significant increase in risk of blood loss. A bit of care is needed with the Artist Club type razor without a great increase in performance, and I've personally gone back to the "ordinary" Professional blades in the black case.
But if you use an SE type razor like a Cobra or Mongoose, I'd highly recommend these.
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