Ergo360 Ultimate Gel Armrests offer maximum comfort with thick gel cushioning. The black outer material is soft, breathable and durable. These chair arm pads are 10" Long x 3.5" Wide x 1.25" Thick. The top support surface is flat and the edges are smoothly rounded. This product is compatible with office chair arms that have either 4" or 5.5" center to center screw hole spacing, attachment screws are included for Free. Ergo360 Ultimate Gel Armrests are also compatible with most wheelchairs. Click on the pictures to view chair arm pad dimensions and details. Armrest pricing is per complete pair (right and left), specify a Qty of 1 for 1 pair.. a Qty of 2 for 2 pair.. etc. Please measure before ordering.