About this item Bumper plates are constructed of high density rubber with solid stainless steel inserts that can withstand repeated drops and with minimal bounce Each bumper plate has an inner ring with a diamter of 2" and fits any olympic barbell, dumbbell bar or sled with a 2" diameter Each bumper plate is color coded for easy identification and labeled in both lbs and kgs IMPORTANT - 10lb plates can bend when dropped ALONE while on a barbell