Premium Alignment Putting Mirror with Our Exclusive Clear Adjustable Guide Rails - Leading Practice Aid for On-Line, Consistent Putting Stroke - Size : 17.5" x 9.3" - Golf Putting Aids/Putting Set The new 2018 version of the Golf4Yous True Line Putting Mirror stands out by being 100 to 300 % larger than the competition making your putting experience much easier. On top of that, we perfected the product by adding 2 adjustable guide rails, it will always help you establish a consistent " Straight back - Straight through " putting stroke. Let the mirror automate your putting stroke! The True Line Putting Mirror will help you improve the accuracy and consistency of your putts by ensuring that both your eyes and shoulders are properly positioned above the ball which will help you to accurately see the line.  Perfect for players of all levels: Advanced / Beginner / Right Handed / Left Handed / Men / Women / Juniors. BONUS: You will get a complimentary Golf Training Ball that perfectly complements the putting kit. Designed to provide instant Feedback on your alignment and stroke. The True Roll Putting Ball will give you a clear vision of your putting trajectory. When you hit a good putt, the center line will stay straight; if your club - face is too open or too closed, the center line of the golf ball will flicker. EXTRA BONUS: You will also get a Golf Ball Liner with a felt marker so you can mark your own ball. The true secret of professional golfers for proper alignment is to draw a line on their ball to match their line of sight.  The carry bag allows you to bring your mirror anywhere you want and makes everything easy to store and protect. Guaranteed Quality Product & Charity Involvment  Golf4You has a charity program  and donates a portion of your purchase to a charity. On every sale of Golf4You products, a percentage is collected and is donated to the "Sudden Death Foundation". Our goal is to promote awareness and fund medical research on cardiac abnormalities resulting in sudden death.