Turbo Grips Thumb Slug Grip (Bag of 10) Bowlers prefer our Urethane Solid over any other brand because of the consistent feel, smooth release and clean finish it has to offer Pro shops prefer them because they are the easiest to cut, carve and finish; Solids are pre-sanded on the outside surface for easy install Duo-Color Urethane Solids go a step further to help pro shops consolidate inventory while at the same time expand color selection