The 7033HD 24lb Retractable HD nylon bladder assembly. The 24lb Retractable will fit only the Zeagle Backplates and BCD"s The Retractable is a Small Lift (24lb) Bladder Assembly that is shaped to fit snugly around a single cylinder used with the Zeagle Metal Backplate and BCD"s. It features a extremely compact bladder assembly with elastic cords that expand when air is added to the bladder but contract when the air is, (unlike some other makes of wings the cords do not "wrap" around the bladder and therefore cause no air trapping) This lowers the surface area of the BC and lets the diver move through the water with less effort. This wing has two Over Pressure Valves (OPV) and comes with a 19" corrugated hose with a standard inflator.