I got all of these frags from a guy at the same time, dont know how long he had them but they are all pretty well encrusted onto the discs, but the discs are like 1 inch thick, I was just looking for a way to avoid the big bump in the middle once the creep off on all sides and encrust the main rock. I guess it is what it is and I will just live with it. Good thing about them is, if I decide to upsize, moving those will be pretty easy since they havent reached the main rocks yet.