Two sets of 4" casters (non-locking) ordered. When they arrived I was disappointed to find that one set was like the picture and the other set was a mixed set of different wheel colors and one had a locking roller and the other three didn't. They all appear to be the same size and are quite heavy, so trying to get them back will probably be more trouble than it's worth. However, I was planning to use them for two mobile cabinets and now I have to hide the mismatched wheels in the back. I also can't be sure if I got the ones that rated highly, so I'm hoping they're all of the same good quality. They appear solid and well made, but if you're worried about how the reels will look on the finished product, beware the buyer.