Features 1. This professional putting bubble level helps train your eye to detect subtle contours on the green that can affect even short putts. Regular use can improve your putting accuracy. 2. The golf ball marker is lightweight and portable, designed to be carried easily in your pocket during play, and durable enough to provide quick readings of green contours. 3. The marker has sufficient weight to remain flat on the putting surface, allowing for more convenient and precise adjustments. 4. This tool indicates how to adjust for slope, especially useful when the surface appears flat but has a slight incline. 5. With practice, it helps assess the degree of break on putts, reducing time spent reading greens and improving line judgment. Specification Material: Acrylic Color: Yellow, Blue, White Size: 6 x 6 x 2 cm Weight: 30 g Package Include: 1 x Golf Ball Marker