
Many years ago. maybe 8 years, I bought a bunch of different brands. Although the "Feder" brand was the sharpest, these extra derby blades were sharp enough to outperform all other brands I've tried (about 7 or 8 marks). 50 blades should last me at least 5 years. Cheaper than any store I've ever bought them from. I have thick facial hair and each side of the blade will do about 6-8 shaves. Additionally, they're "pleasant" to use and don't cause me a severe razor burn on even the most aggressive settings on my Mercury.

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