The Ebonite Entity New Without Box 15lbs Bowling Solid is a high-performance ten-pin bowling ball designed for medium to heavy oil conditions. This asymmetrical core ball from the United States Bowling Congress (USBC) comes with a manufacturer warranty of 2 years and is undrilled for customization. With its weight of 15 lbs, this bowling ball is ideal for serious bowlers looking to achieve high performance on the lanes.