Description: Purpose of Training: This billiard training accessory is designed to enhance the linearity and stability of your cue action, improving your overall performance in games like snookerMaterial: Crafted from high density board and billiard cloth, this training device is built for repeated use and long time durabilityProduct Dimensions: The cue action trainer features a coil diameter of 20mm, making it suitable for both large and small headed cuesComplete Package: Each package includes 1x cue action trainer, providing everything you need to start enhancing your game immediatelyDesign: Simply attach it to your cue and begin practicing; it's an essential tool for beginners learning new skills as well as experienced players looking to refine their Specification: Material: High density board cloth Size Chart: 40cmx20cm/15.75inchx7.87inch Package Includes: 1 Billiards Stroke Trainer Note: Please allow slightly errors due to manual measurement and different monitors.