Fiberglass Muffler Packing - 10-1/2"x16" Repack blown-out silencer for quieter running and more power, Long-filament fiberglass made especially for muffler packing, Measures 10-1/2" x 16", more than enough to repack virtually any 2-stroke silencer, Resists breakdown up to 1,200? F, Made in the U.S.A.