The life maxx lmx85 crossmaxx competition bumper plates are fantastic plates to have in any commercial type gym these plates should be used with a bar that has the diameter of 50mm and come in a range of different weights so that you can find the best plates for you as well as being given the option to mix up each workout the weight has been displayed on the plates in a colour coded design so that you can clearly see which size weight you are using at the time these plates have been produced