SpecSeal SSB Series Firestop Pillow 2 in. x 6 in. x 9 in. SpecSeal Firestop Pillows are through-penetration firestop products resembling small cushions or soft bricks. These intumescent and highly resilient pillows are installed in openings by compressing and stacking into the opening in a brick-like fashion. SpecSeal Firestop Pillows consist of a mineral fiber core material sealed with a water-resistant intumescent membrane. This coated core material is then heat-sealed in a tough, nonirritating, fire-retardant poly bag. Features: Intumescent: expands in all directions for a tough, tight seal Reinstallable for easy retrofitting of cables Single-side application makes installation easy for tough access openings Intumescent coating on all sides for faster expansion and easier installation Heat-sealed poly cover protects core and makes pillows slide in and out with ease Superior air leakage ratings Broad base of tested systems UL Classified and FM Approved Product Sheet: Spec Sheet