- PREMIUM KITCHEN KNIFE SET: OOU black knives are made of high-end German 1.4116 stainless steel with 8 times of hand sharpened 15° blade edge, 56HRC hardness and 9N sharpness. The cutlery features innovative patented OPD and BO oxidation technology. Each single knife is ultra sharp, super rustproof, dishwasher safe and has a modern look. All our knives are certified, very healthy and reliable.
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