These chair arm pads offer plenty of length to support the whole forearm. The main supporting surface is slightly concave to cradle the arm, with convexly rounded cushioning near the front. These pads are 3.5" wide and 12" long. The bottom attachment screw holes include both 4" and 5.5" spacing (center to center) and will mount on top of many kinds of chair arm posts. Pricing is per complete pair of chair arm pads.