Roto Grip has engineered the TNT upper-mid performance bowling ball to offer more torque and more power than previous low RG symmetrical balls. The core and cover combination on this ball create an explosive reaction, as the name suggests. This ball introduces the Torpex core which places the Torque Sphere just above the mid-point of the core. This design creates a low RG and a high differential which results in more motion and more continuation through the pins. The coverstock on this ball is the proven eTrax PLUS Solid Reactive. This coverstock provides more grip and response to friction while still offering ease through the beginning of the lane and ultimately more forgiveness on medium to medium/heavy oil. Color: Amber/Fire/Blaze Orange Core: Torpex Coverstock: eTrax PLUS Solid Reactive Hook Potential: High Finish: 2000-grit Abralon RG: 2.47 (for 15# ball) Differential: 0.052 (for 15# ball) Recommended Lane Condition: Medium to Medium/Heavy Oil Brand: Roto Grip Category: Bowling Balls Ball Performance: Upper Mid-Performance Balls