"BirdieBall® by Birdie Ball Inc. is the best golf training aid invented this century! Golf coaches and golf instructors around the world are saying exactly that! It is limited flight practice golf ball without limited feel. True feel with a long hang time, golf ball-like, trajectory! But it only flies 40 yards, so you have your own backyard driving range. Take a full swing. Draw it Fade it. Grab a buddy, get 40 yards apart and hit them back and forth. You wont believe the turbine sound created by the high rate of reverse spin. And it won’t break like other perforated practice balls or wiffleballs"
More info
http://tryus.dk/birdieball/
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It looks more like something that you would practice putting with like through that hole.
