The Rst Hyperdrive Pearl Bowling Ball by Roto Grip is a high-performance ten-pin bowling ball designed for medium-heavy lane conditions. With a 15lb weight, this asymmetrical core ball features a pearl reactive coverstock for maximum traction and accuracy. Ideal for competitive bowling, this United States Bowling Congress (USBC) approved ball is perfect for serious bowlers looking to improve their game with a top-quality piece of equipment.