Listing for 1 case containing 10 PAIRS (20 pcs) arm pads is suitable for use on many typical office chairs. The pads have very minor indentations on top surface as they were packed at factory before the PU had cured completely. The simple yet durable design insures many years of use. These chair replacement arm pads should fit all styles of arm bracket with 4", 4.75" and 5.375" center to center mounting hole pattern. mounting screws are included. If interested in 3 or more cases, we offer volume and combined shipping discount.