Poor alignment is the major cause of missed putts. Using the Alignment Mirror will create confidence on the green. It measures 12 x 6 and comes with a black carry bag.The Putter Gate Slots let you set up a gate of tees for the toe and hell of the putter to learn to swing and create sweet spot contact in the center of the putter face.This easy to use Putting Mirror is highly portable and great for checking your setup on the green. Keep it in your bag and use it when you practice or warm up before a round.