Features: This training tool helps you perfect your swing by ensuring the pipe stays in the center of club line, indicating correct practice. The double ball feature enhances balance training accuracy, while the plastic and fiber materials provide impact resistance for long terms use. Small and portable, this golf training ball is perfect for sharpening your putters, whether you're practicing indoors and outdoor. Whether you is a novices lookings to develop basic skill / experienced golfers, this golf training ball is the perfect addition to your practice routine. Improve your golf putting skill and balance with our golf training ball, which perfect for golfers. Specifications: Material: plastic and fiber Size: about 10.5x4.3cm/4.13x1.69inch Package Includes: 1x Double Putting Training Ball note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.