77tech 10' Golf Practice Net Driving Net System Tri-Ball Hitting Net with Target The Putting Alignment Mirror is a small mirror that is great for checking your setup on the green. Keep it in your bag and use it for practice or warm up before a round. Using the portable mirrors within golf practice when teeing off or for perfecting swing at home can immediately identify bad posture. The golfer will be made self aware, altering any incorrect movements and allowing their teacher/coach to focus on other aspects of the class. The Portable Mirrors prevent time wasting and enable the training to move forward at a faster pace. Product Dimensions: 12.2" x 5.7" (31cm x 15cm) without golf ball