A Golf Invention With a Great ROI
Yes, ROI (return on investment) not MOI (moment of inertia). Some of the best golf gadgets are the simplest and the invention disclosed in USPN 
The patent describes the invention as:
A ball retriever for use on golf balls by being selectively positioned on the head of a golf club iron. The ball retriever defines an open cup having contoured side walls with a cutaway area where for visibility during use. A powerful magnet is secured within the base of the cup providing magnetic attraction and selective positioning and removal attachment on to any ferrous metal club head face.
This product would be a great promotional give-away. Give me a quote for 100!
Dave Dawsey – Keeping an Eye on Golf Ball Retriever Inventions