The Z-URS features a brand new urethane cover which is the softest urethane cover Srixon has ever created. This provides incredible feel, pinpoint approach iron precision and greenside control. The Z-UR features all the power of Srixon technology harnessed into our longest, most playable tour performance ball yet. An incredible membrane thin urethane elastomer cover, which surrounds the largest, fastest energetic gradient growth core. A proprietary compound called bis (pentabromophenyl) disulfide or PBDS added to the core delivers amazing resilience and initial ball velocity with low spin. Srixon Z URC golf balls offernbsp;accuracy around the greens and off the putter. These golf ballsnbsp;are part of the Srixon ballnbsp;franchise that has turned out great results on the golf courses