Upper Mid Performance Track’s 715T is the first “T” (Track-tion) ball released in the 7 series; designed to be a stronger version of the popular 505T. The designers set out to make a more aggressive product by using an all new UMP GEN4T coverstock. This cover has a larger footprint on the lane to help carve through the head oil. The “Catback” core was unchanged and is still a 0.015 intermediate differential, which gives this ball unbelievable striking power. Color: Red/Yellow/Blue Core: Catback Core Type: Asymmetrical Coverstock: UMP GEN4T Finish: 500/1000/2000 Abralon RG: #16-2.56, #15-2.52, #14-2.53 Differential: #16-.046, #15-.052, #14-.045 Reaction: Track-tion Recommened Lane Condition: Medium to Medium-Heavy Ball comes with a microfiber cleaning sack with instructions on its use. Upper Mid Performance Track’s 715T is the first “T” (Track-tion) ball released in the 7 series; designed to be a stronger version of the popular 505T. The designers set out to make a more aggressive product by using an all new UMP GEN4T coverstock. This cover has a larger footprint on the lane to help carve through the head oil. The “Catback” core was unchanged and is still a 0.015 intermediate differential, which gives this ball unbelievable striking power.