Description: 【Billiards Cue Training Device】: This is a billiards cue training device, designed to help you improve your basic skills and accuracy in the game of pool. It's great for both beginners and experienced player who want to enhance their performance 【Dominant eye detection function】: The Billiards training aid features a unique design that helping you adjust your dominant eye line with the trajectory of the ball. This helps in improving your and precision 【Straightness Practice】: With this training tool, you can practice maintaining straightness, which is crucial for successful gameplay in billiards. It provides an effective way to check and correct your cueing action 【Versatile Compatibility】: Suitable for 57.2 and 52.5 size , this Billiard Stroke trainer suitablefor player of all seeking consistent improvement in their performance 【Quality Material】: Made from PP material, this training equipment is built to last Specification: Material: PP   Size Chart: Length 20cm/7.87inch Package Includes: 1 Billiard Stroke Exerciser Note: Please allow slightly errors 1-2cm differences due to manual measurement.