I have a pair that, from the look, size and placement of the logo, and the checkering, are from grips4u, although my son got them for me as a Christmas present, so I can't be 100% positive. I have a couple hundred rounds on them, and they seem to be holding up. I know this isn't much help - later in the summer, I'll know more. They are good looking, though, and fit, perfectly, once I put the inserts that CZ sells in them. Prior to that, I had to tweak how much I tightened them to akkow the mag to drop - too tight and it bound. With the metal inserts, that is not an issue.