The simplest and most versatile Putting Aid invented. For beginner to tour professional. Universal fit for any putter, and it fits into your pocket for easy travel. It can be used on the putting green, or the golf course, for any length putt, and any breaking putt. Snaps on and off the putter in 5 seconds. Putt with it on the putter for instant feedback. It gives you the feel of the correct tour stroke. Then, just flip it up to copy the putting stroke you just learned. Never allow putting to be a mystery again. Made and manufactured in the USA! Invented by a PGA Professional.