•Tested for both standard and shaft wall construction•Allows for 100% compression and extension•Red in color for easy identification and inspection•Red in color for easy identification and inspection.Track Top Gasket for 6" J-Runners,150 F TTG elimites the need for firestop sealants or sprays by firestopping as the wall is constructed. Track Top Gasket is easily cut to length with scissors or a sharp knife, installing quick with no waste.