The GOFAI Sound Isolation Clip is a resilient sound isolation clip used to attach the gypsum wall board (GWB) to interior walls and ceilings. Each Sound isolation Clip has a design load rating of 36 lbs. and can support up to two layers of 5/8 gypsum board when spaced no more than 24 x 48 on-center. grace at gofairubber dot com