These plates are strong, durable and accurate. Our Olympic Pro Steel Plates boasts a colour for each size for easy recognition as well as having the weight clearly indicated on the side of the plate. Not only are the 15-25kg the same dimension as bumpers, The super thin form of all the plates allows you to load much more weight onto your bar than any grade of bumpers. The thinnest of the plates is the 0.25kg at 1cm up to the 25kg plate that is a mere 2.3cm. The smaller fractional weights are great to get to that maximum weight precisely and for increasing personal bests.