Billiards Cue Training Device: Helps improve basic skills and accuracy in pool, suitable for beginners and experienced players seeking performance enhancement. Eye Line Correction: Unique design allows merging two lines into one when looking down, aiding adjustment of dominant eye line with ball trajectory to enhance precision. Straightness Practice: Effective tool for practicing cue straightness, crucial for successful billiards gameplay, helps check and correct cueing action. Versatile Compatibility: Suitable for Chinese, American, and Snooker billiards, ideal for all players aiming for consistent improvement. Quality Material & Size: Made of PP material for durability, dimensions 22cmx5cm/8.66inchx1.97inch, compatible with both large and small tip cues. Color: As shown in the picture. Package Includes: 1 Billiards Stroke Trainer. Note: Please allow slight errors of 1-2cm due to manual measurement.