This is great traning billiard pool cue ball to improve your skill Made out of the most advanced phenolic resin The six red dots will also allow you to visualize the intentional and unintentional spin you apply Enhance your performances Color: white Diameter: 2.25 inch (57mm) Material: Resin The center of gravity at the center of the ball guarantees a perfectly true and accurate roll Elasticity of the phenolic resin is calibrated for optimal rebound to perfectly control the effect on every shot Package Contents:3 x billiard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.