The center fill type with rubber pads on the side. Got one now that's in good shape with minor dings that ive filled and was gonna paint but thinking now I want a straight one that I can strip, polish and clear coat. Just don't want one bad enough to pay stoopid eBay robbery prices. You could almost buy an alloy or glass tank for what those crooks want for a stock tank. Don't need the badges or pads. Can throw in mine for the deal if need be. Thanks, jw