This Roto Grip Halo Bowling Ball is a high-performance ten-pin bowling ball with a multicolor reactive resin coverstock and a matte finish. It has an asymmetrical core type and a differential of .050, making it suitable for heavy lane conditions. The ball is drilled and has a weight of 15 lbs. The Roto Grip Halo Bowling Ball is a United States Bowling Congress (USBC) approved product line and is made of resin material. It is perfect for bowling enthusiasts and is designed to provide excellent grip and control on the lane. This ball is a great addition to any bowling bag and is sure to improve your bowling game. Only bowled maybe two games. Span 4-1/2 inches left hand drill