This is the Apeks WSX Air Cell 25lb OR 45lb OPTION

Features:
WSX Air Cell 45lb:

• 200N (45lbs) lift
• Armoguard protects the bladder against abrasions in confined spaces.
• Reversible inflator can be mounted on left side, right side or the upper left shoulder.
• Grommets at lower corners allow for mounting bungee to keep the bladder streamlined to your body.

WSX Air Cell 25lb:

• 25lbs lift
• Armoguard exterior
• Additional protective layer of Armoguard protects the bladder against abrasions in confined spaces
• Reversible inflator can be mounted on left or right side
• Grommets at lower corners allow for mounting bungee to keep the bladder streamlined to your body

The bladder is constructed from Armoguard™, a super-tough material normally found in public safety diving and military products. This smooth material is ten times more abrasion resistant than standard CorduraTM (the material used on many other sidemount harness bladders), making this a wing designed with serious sidemount diving in mind.