Durable Resin Billiard Practice Training Pool Cue Ball Snooker Training Balls Cueball 52/57mm Table Ball Features: brand new and high quality. Made of high quality Resin, unique impact, wear resistant Calibrated and polished for billiard practicing The standard lines and dots for players easy to pot & control the ball Specification: Color: white, red Material: resin A/B/C Diameter: 52mm/2.05" Weight: about 130g D Diameter: 57mm/2.24" Weight: about 170g Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 Billiard Training Ball