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Today I found out that with a single-edge razor, where only one side of the blade is sharp, I can simply install the blade in reverse. Consequently, even without a travel case,
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Derby Professional Single Edge Razor Blade 100-Pieces, 0.04203 kg : Amazon.co.uk: Health & Personal Care
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Safety Razor - Mens Razors Best - Double Edge Single Blade Razor - For Men - Stainless Steel - Chrome – Barbarossa Brothers
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Dorco Single Edge Blade - CoolBlades Professional Hair & Beauty Supplies & Salon Equipment Wholesalers
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