I have some from USG a german tack company and they are great. They don't move at all, no rubbing, they can easily be clean and are available in more colors then only black. I can highly recommend these to you when you wanna try t hem. hope this helps.
As said before I find they still move, I prefer rubber ones or the Lemieux style ones.
Hope this helps
I normally find that they still turn- I just use the pull on rubber ones
I prefer den over normal ones especially for jumping
Is there a reason you are considering them?