The Z-UR features all the power of Srixon technology harnessed into our longest, most playable tour performance ball yet.It features an incredible membrane-thin urethane elastomer cover, which surrounds the largest, fastest energetic gradient growth core we’ve ever developed.A proprietary compound called bis (pentabromophenyl) disulfide or PBDS added to the core delivers amazing resilience and initial ball velocity with low spin.The 330 dimple pattern combines high trajectory with a penetrating ball flight for stability in all cross winds and head winds.The soft and shear-resistant polyurethane cover means the Z-UR lands gently, and stops where it lands.12 Ball Pack