I havent had any troubles with them. One package I had bought one of the blades had a nick in it so I tossed it but only saw the nick after I tried to cut some fabric. So as I was putting it back into the packaging so that I could tape it up really good to put into the sharps container, stupid blade came through the cardboard and cut my thumb so be careful with them. But that is the only blade I have had trouble with.