Slight adjustment on thumb span...The 14lb Hammer Black Widow Tour V1 bowling ball is a high-performance ten-pin bowling ball designed for medium-heavy lane conditions. Made from reactive resin urethane with an asymmetrical core, this ball is drilled and tailored for specific performance needs. With a vibrant multicolor design and a RG of 2.500, this ball is a top choice for competitive bowling enthusiasts looking to enhance their game on the lanes.