Wear Resistant: This billiard cue stroke training tool is made of high-quality acrylic material, sturdy and easy to clean, ensuring long-term use. Easy to Use: The perforated design on the ball aids in more accurate aiming and striking. Feature: The billiards practice ball is lightweight and compact, portable and easy to carry, and does not take up much space. Suitable for Cue Stroke Practice: The billiards training ball helps improve the stability of your cue stroke, making it a useful training tool for both beginners and experienced players. Versatile Use: This billiard cue stroke exerciser serves as a practical tool for personal practice and can also add fun to friendly matches or gatherings. Specification: Material: Acrylic Note: Target ball number is random. Size Chart: Diameter: 57.2mm / 2.25 inches Hole: 18mm / 0.71 inch Package Includes: 1 Billiard Practice Training Cue Ball with positioning circle Note: Please allow slight measurement deviations due to manual measurement and differences in display monitors.