Face the facts – Urethane is here to stay. Join the movement with U-Motion from Brunswick. After months of testing and research, Brunswick has nailed down the perfect urethane motion. The new U-Motion symmetric core, with high RG/low differential, provides a smooth, consistent roll like you’ve come to expect from urethane bowling balls. Take all the “guess-work” out of your game with its predictability. U-Motion was one of our biggest ball tests over the last 6-9 months, we understand the need for urethane and tested many different core designs and urethane formulas. The core features a higher RG and lower DIFF for excellent urethane ball motion. The U-Motion will provide consistent and predictable ball motion on any condition and is most effective on lighter volume and shorter patterns.