I had a guy buy them for his table a couple months ago also a GC2. They fit fine but the ball doesn't always go through the hole in one of the side pockets. I will say there's the same problem once in awhile on an original corner pocket where I play, usually when it's a soft hit. I think it sometimes can happen if the rubber is a little out of shape. I told the guy to keep a ball in the shoot of the pocket when he's not playing to help it's memory. I'll have to check in with him and see how it's going.
I was talking about ball return pockets, so not sure about the drop pockets. The material is fine and no marking on the balls with them.
They are a hard plastic. They'll work, but I don't like them.
These are the best reproduction Gold Crown pockets on the market. I had the drop pockets before I converted my table to ball return and now use their gullies. In this case, you get what you pay for.