The HOG 35lb Wing is the ideal choice for double aluminum tank or smaller twin tank diving. The Wing features the extremely low profile donut wing shape so popular with diving today, as well as an centered inflator hose elbow to eliminate interference with regulator first stages. Made with a durable 1680 Ballistic Nylon Shell and 220 inner bladder, it is tough enough for hog to offer a 10 year Pinch Flat Warranty! Not to mention....MADE IN THE USA!!!!