The Hammer Black Pearl Urethane Bowling Ball is a single 15 lb. bowling ball designed for ten-pin bowling. It features a black color with a urethane coverstock and a symmetrical core type. This United States Bowling Congress (USBC) approved ball is perfect for competitive bowling and has a RG rating of 2.500. Made by the reputable brand Hammer, this ball is a high-quality option for any serious bowler looking for precision and performance on the lane.