I had a few of these lying around and tried one in my Rockwell 6C. I liked the way it worked and ordered some more. The new ones came in plain white wrappers instead of the red ones with a picture of a razor blade on it. These new blades are awful. They look the same, they have the same writing on them, but they don't perform the same. I can't imagine anyone would go to the trouble to counterfeit these blades, but after several back to back tries I am certain that the new blades are just not very good. Does anyone have any explanation for this? Has anyone had the same thing happen to them? And what is a good source for the "good" Israeli Personna blades?