Hog-rings can be described as “glorified staples” which are used to attach the listing wires sewn onto the back of the upholstery to the listing wires embedded in the seat foam. These are specialty metal clasps with hooks on each end that are loaded into a pair of hog ring pliers and are then squeezed into a ring shape to close the loop and firmly attach the upholstery to the seat core. Typically, one bag will be more than enough to complete a full installation, but some installations do not require any hog-rings at all. Please check with our upholstery specialists to see if they are required for your specific vehicle application. You can find more information on the tools used for the installation of our interiors in LeatherSeats 101 under Installation Info.