The life maxx lmx87 crossmaxx bumper plates are made of high quality durable vulcanised rubber which makes them perfect for intensive commercial use the steel inner ring has been built in such a wait that it is virtually impossible for it to become loose so no need to worry abut the plates becoming broken in any way the bumper plates are made accordingly to iwf standards however are made slightly smaller so that more can be fitted on the bar as well as being easier to use the high density of