HOG brand (Highly Optimized Gear), Donut wing for easy air management and venting. The durable outer case has a zipper to allow users to replace the inner bladder in the event damage to that bladder. 

For those that already have a single tank backplate and wing setup, this is the wing (bladder) you will need to adapt your rig for double tank diving. 

Available in two sizes; 38 and 50 lb.

On the wing size, I recommend 38 lb if your use will be mostly AL doubles or small steel doubles (10-12L). If you plan on diving 14 or 18L Steel doubles, then you'll want the 50lb doubles wing.

Prices (pre/post 8% tax)
JPY 27,500/29,700