Brunswick Butterflies Glow Viz-a-Ball Bowling balls with exclusive 360 degree, limited edition graphics; at the bowling center or on display in your home or office, there's nothing cooler than a viz-a-ball; Real bowling balls designed with your favorite images; Coverstock: plastic/polyester ball finish: high-gloss polish hook potential: 25 low recommended lane conditions: any Patterns may not align perfectly and there is a very small seam where the patterns come together which does not affect the performance of the ball