The Seachoice Boat Trailer Bunk Carpet protects your boat's hull from mars and scratches. Helps in launching and loading. Made of black solution-dyed polyester that is superior to polypropylene (3/16" thick). Won't fray or unravel. Resists mold and mildew. Easy to cut to any size. Use the 8"x12" for 2"x4" bunks and the 12"x12' for 2"x6" bunks.