Ideal for replacing rusted-out exhaust bafflesWork great for custom fabrication as wellTubing is 22-gauge 409 stainless steel with 1/8" diameter holes, 3/16" staggered centers, 33 holes per square inch and 40% open area2.5" diameter tubing is 16-gauge steel; perforated sheet is 20-gauge steel24" long baffles available with or without packing; muffler packing also sold separatelyMuffler packing sheet measures 10" x 12"; 5/16" thickBaffles with packing include two sheets of packing materialAll styles sold each