Features 1. This pro putt bubble level will train your eye to see the subtle contours that can make even a short putt difficult. The more you use it, the better your putting game will be. 2. Golf ball marker is lightweight enough to carry in your pocket during play, sturdy enough to provide a quick reading of the greens contours. 3. The golf marker is heavy enough to lie flat on the putting green, makes adjusting more convenient and accurate. 4. This golf marker will tell you how to adjust for the slope. Its most useful when you think its flat but theres a slight slope. 5. With practice you can read the severity of the curve when you put, spend less time trying to determine the break on the green to read their line. Specification Material: Acrylic Color: Yellow, Blue, White Size: 6 6 2 cm Weight: 30 g Package Include: 1x Golf Ball Marker