The SRS magnetic pool cue ball is made from polyester resin with scratch, chip, and ding resistance. It is engineered for perfect roundness and balance, ensuring superior playability and durability. The cue ball measures 2.25″ in diameter and weighs 6 oz. The magnetic ball has a ferrous core that automatically separates it from the other numbered balls within the ball return system on a coin-operated pool table.Features:Regulation weight: 6 ozRegulation diameter: 2.25Formed from polyester resinScratch, chip, and ding resistantMagnetic core for use on ball return systems using a magnet for ball identificationDetails:Ball type: Cue BallMaterial: Polyester ResinIndividual weight: 5.8 ozChip and Ding ResistantRoundness tolerance: .005