Credo replacement Blades-2 packs of 10

I can truly say that the Credo brand is without a doubt the best blade for removing dead skin and callouses from my feet. I know because I've tried other brands and my pedicure turns into a nightmare. They quickly lose their edge and I have broken handles applying enough pressure for them to work, which they don't. I have become incredibly flexible though. I wonder if the circus would hire a 65 year old fat lady as a contortionist.