The Zeagle 7724BP Big Bertha Bladder Assembly has the new style sewn-center-panel, that now allows it to fit on the Zeagle and most other brands of Metal Backplates as well. The Big Bertha is an Extremely High Lift (85 lb) Bladder Assembly. It features two completely redundant inner bladders with separate corrugated hoses and power inflators. It has two Over Pressure Valves (OPV) (one on each inner bladder) and comes with 19" corrugated hoses. NOTE: This style Bladder Assembly with the sewn in center section is for use with Metal Hardplates only. There is another style 7724 that looks exactly the same, but does not have the sewn in center section and can be used on standard Zeagle BC such as the Ranger or Tech.