MAC Ultimate Knives MAC Ultimate Knives offer the ultimate combination of high carbon steel, Chrome, Molybdenum, Vanadium, and Tungsten. Carbide makes the blade harder and more durable than most other brands on the market today. These great knives are resistant to rust and stains and provide a razor sharp edge and comfortable balance. Hardness is between 59 and 61 degrees Rockwell. Not dishwasher safe.