the original set be very difficult to use , the weight stick together and I have to pry they apart . I discover that one of the weight be completely bent which be why that one be SOOOO hard to use . I call Sport Block and they send I new weight and pay to have the old one return to they . they make the return hassle-free which I really appreciate and the new weight work perfectly , the weight do not stick together at all . I do wish I have not have to go through the hassle of have they be so frustrating to use -lrb- before I have they replace . -rrb- I be very surprised there be not a better quality control system in place with the company , but at least they make it right and I be very happy with the weight now .