Momentus XL Iron
The XL Iron is the 21st Century version of those earlier fan shaped training aids.  The XL Iron gives you incredible resistance training both in your backswing and in your throughswing.  The extreme size of the XL Iron's clubface gives you the heightened visual awareness of the club face angle.  Includes DVD with Drills and Instructions by Sean Cochran, Fitness Trainer on the PGA Tour.