Sharper Golf Premium Putting Mirror Large 9.25" x 17.5" with Guide Rails | Putt Swing Alignment Trainer, Portable Training Aid, Practice Equipment | Eye Path and Starting Line Trainer

The mirror itself is sturdy and lays flat. It has holes to put tees in if you are using it on real grass. You attach the clear plastic alignment rails with included screws and can adjust the location based on the length of putt you are practicing and also the width to fit any size putter.The clear plastic alignment rails are easy to put on but somewhat difficult to get lined up straight which is the only thing preventing me from giving this 5 stars.The item also comes with a green clip you can use with a permanent marker to add alignment lines to your golf ball.

Father in law loves it, practices daily with it.

The product came in just as expected/described. I set this up in my house and use it while at work and it really is awesome. I don’t really use the mirror aspect of it but using the rails has helped a lot and has helped straight out my stroke and has built good muscle memory which had made me feel more comfortable putting without fear of getting wobbly hands. Also Joe was awesome with customer service. I accidentally broke one of the rails while recently moving and reached out to him on Instagram and he sent me replacements free of charge so really can’t beat that.

It helped my putting, but no instruction on the green clip-on ball thing

The customer service is the best I have experienced on Amazon. Seller was very responsive when contacted. The product itself is extremely helpful. It will definitely help any golfer on the basic technique of putting. My son's game has improved dramatically...went from 3 putting to mostly 2 and 1. Overall, a great product with terrific customer service.