The Hammer Special Effect Bowling Ball is a high-performance 15 lb ten-pin bowling ball designed for serious bowlers. With a unique multicolor design and reactive resin coverstock, this bowling ball offers excellent performance on the lanes. The asymmetrical core and .050 differential provide a consistent and reliable ball motion, making it suitable for competitive play. Drilled specifically for a single player, this Hammer bowling ball is sure to enhance your bowling game with its superior quality and performance. This ball is drilled for a left handed bowler and is set up for a JOPO thumb.