The 1 lb roll of 316 stainless steel wool is approximately 1/2" thick and 4" wide and is wound onto a 2" core to an outside diameter of about 6" and is approximately 30 -35' long. It is enough material to wrap a 2"diameter baffle x 19" long to an outside diameter of approximately 5" when properly wrapped to the right tension. Stainless steel wool products withstand temperatures in excess of 800°C, exhaust acids and high vibration.