The USA Sports Regular 1Inch Gray Plates are used with regular standard bars and regular dumbbell handlles. They are shaped flat like a pancake which makes them ideal for stacking and also features a machined center hole making it easy to slide on and off the bar. They have a high quality enamel finish and will not chip, rust or peel. They are sold as singles be can be bought in pairs as well. These plates are available in 1.25, 2.5, 5, 7.5, 10, 12.5, 20, 25 and 50 Lbs.