No they don't stay sharp longer than other blades, but that's fine, I get a whole lot in a package and they are so good that I don't really mind. I think I go through two packages in a year, or less.
I'm just not sure if you can get them? My dad orders them for me from a dentist-place. I use non-sterile ones.
Charlotte Pijnenburg CharArt Because tack will always make it better! charart.wordpress.com/