Used on c-17a aircraft. stock size is 7 x 42; material consists of a molded silicone elastomer core per dms 2221 type 1, grade 50; cloth polyester mesh cover per dms 2356 type 1, class 4; fabric, glass b-stage polyester resin impregnated ply per mil-r-7575 form b, class 2 grade b resin, class 1 cloth