Firestop Pillow, Fire Rating 4 hr, Fire Resistance Type Intumescent, Firestop Type Pillow, Interlocking No, Overall Height 6 in, Overall Length 9 in, Overall Width 2 in, Color Red, Features Installs from a Single Side, Re-Enterable Allowing for Future Work in Previously Sealed Openings, Tested in a Wide Range of Construction Types and Configurations, For Material Type Concrete, Gypsum, For Use On Busway, Cable Trays, Cables, Duct, Pipe, Maximum Service Temperature 130 Degrees F