Rosemaray Millette's delicately detailed Swallowtail Butterfly artwork captures a quiet natural moment. This is one of the many "stock image" bowling balls that are available. Custom "stock image" bowling balls take 2-3 weeks for production and shipping. These are made of a polyester material and are very similar to the "Viz-A-Ball" Bowling Balls. These bowling balls are perfect for the recreational bowler, bowler's who prefer to throw the ball straight and competitive bowlers for shooting spares at those pesky corner pins.