Aramith 2-1/4" Regulation Size Billiard/Pool Ball: Coin Operated Magnetic Cue Ball Regulation size magnetic cue ball is crafted from the highest quality phenolic resin which provides exceptional scratch and impact resistance Adheres to the most stringent specifications in the industry to ensure each ball has the right density, balance, diameter, roundness, glossiness, hardness and weight Intended for use on most of today's coin operated tables; Magnetic material is evenly distributed throughout the core of the cue ball A magnet detector within the billiard table recognizes the cue ball and triggers a deflecting device that separates the cue ball to a second chute Using a regulation size magnetic cue ball is a great alternative to using an oversized cue ball; Measures 2-1/4" in diameter