from the manufacturer
hulkfit iron plates are available 2. 5lb, 5lb, 10lb, 25lb, 35lb, 45lb weight increments throughout 1in and 2in hollow diameters.
iron plates can be used with or without a barbell to amplify your workout routine. Use with a barbell for curls and bench press or with out a barbell for floor presses, deadlifts and weighted situps.
synthetic of strong solid iron with a machined hollow and an tooth end to enhance sturdiness