This blade used in the Razorock Mentor as well as DS9 Stainless Razors makes quick work of 4 day extremely coarse beard growth with no irritation. I prefer this blade over the Wilkinson (German) blades, which are also very good blades. I have extremely sensitive skin which makes blade selection a careful consideration, although shave prep is important. I use Proraso Green (Menthol) or sometimes Proraso White (Sensitive) pre-shave creme and my soap of choice is Proraso Red - a winning combination with the Razorock Mentor and Gillette 7 o' Clock Yellow. I will be ordering a 100 blade pack once they are available, no hesitation - a great blade indeed!