Features: Speed ​​and Accuracy: Eliminate guesses in alignment. invented for courses: Legal, portable and easy to use in any round. Professional grades results: Improve data for short and long-distance putters. Permanent marker included: Equipped with black golf marker - open the bag and use it. Simple Alignment: There is a completely flat, aiming outside on the golf ball – pointing exactly where you need the putter. Specifications: matter: ABS plastic Size:‎7.09 x 5.91 x 1.97 inches Practicality: Suitable for a variety of golf course terrain, helping to improve hit accuracy and distance control, suitable for beginners and professional players. Package Includes: Golf assistance tool body × 1 note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you will not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color about the item.