Of course, they must be okay, otherwise they wouldn't be as popular as they are. I think I got one bad one with a "gate vestige" on it that was puncturing my tubes. In plastic injection molding a gate vestige is a little stub of plastic in the shape of the opening (gate) through which the molten plastic enters the mold. It should be broken off and removed when the plugs are taken out of the mold, but I guess I got one with it still intact. It was acting like a thorn and puncturing the tube. Just to be safe I blew off all the plugs and went back to tape. Maybe I should give them another try.

Robert