These have a recent polish. They were seperated for inspection and cleaning. They have new snail gaskets. The nuts,washers and studs are stainless. These are the best style bbf logs because they dont warp. If you have the other style, you know what I mean.The snails are 3" or 3 1/2" and if you ad a small piece of 3 1/2" hose you get 4" exhaust. Great upgrade....I have this style on my jetboat and was going to keep as a back up(they are hard to find). Need cash..$400.00 firm and worth every penny. call 619-405-2005 ask for DON (SAN DIEGO)