Official regulation size and design The Standard Billiard Depot 6 Dot cue ball is 21/4 inches in diameter, meeting the official regulation size for professional and amateur billiard games. Training and practice focus: specifically designed for practice and training to help players improve accuracy, control, and overall gameplay skills. 6 dot design: features a distinctive sixdot pattern that aids alignment and aiming during practice sessions, helping players develop consistent techniques. Durable construction: made from quality materials, built to withstand frequent use and maintain performance over time for longlasting durability. Usage scenarios Solo practice at home or in a club: use the 6 dot reference to focus on alignment and aim, building consistent cue ball control. Coaching or partner drills: implement drills that require precise cue ball positioning and shot planning to improve technique. Tournament preparation and regular practice: simulate real game conditions with a regulation size ball to prepare for official play.