Ballsak Sport - Red/Black - Clip-on Cue Ball Case, Cue Ball Bag for Attaching Cue Balls, Pool Balls, Billiard Balls, Training Balls to Your Cue Stick Bag EXTRA STRONG STRAP DESIGN! *NEW* EXTRA-STRONG STRAP DESIGN Zippable closure Fits any regulation 2 1/4" (57mm) billiard ball Durable EVA shell with soft interior lining Anodized aluminum carabiner