Wilson STAFF ZIP Golf Balls At the Heart of Performance - Low Compression Technology With the launch of the revolutionary, 50 compression Wilson Staff Fifty golf ball in 2006, Wilson Golf charted a new course in high performance golf ball technology. By utilizing a minimum level of curatives in the polybutadiene mix, Wilson engineers created a rubber-rich core that is extremely soft and highly resilient. With this breakthrough core in the center, Wilson engineers were able to create completely new core/cover combinations with outstanding results. Inside, a zero compression core is so soft that it registers "zero" on golf's Atti compression testing equipment. The Zip gets its power from a mantle layer made of a resilient DuPont HPF polymer. Outside, an ultra soft ionomer cover delivers the touch and spin expected from a high performance multilayer ball. It's the perfect option for players seeking soft feel, great distance and greenside control. BREAKTHROUGH SPIN AND FEEL How does the zero compression core inside the new Wilson Staff Zip work? The zero compression rubber core delivers the softest feel possible with high resilience. Wrap a high velocity mantle layer and a resilient ionomer cover around this super soft core and the result is the ultimate combination of distance, feel and spin. Behind the patent-pending zero compression core is a high-velocity Neodymium catalyzed polybutadiene. The unique rubber blend in the core uses a minimum of curatives to produce an ultra-soft (very low compression) core with good resilience. Patented HPF mantle layer encases the zero compression core with a speed-generating mantle for distance and higher iron spin rates Super-soft ionomer cover grabs the club face for higher spin and amazingly soft feel Unique flat-bottomed, shallow dimples rip through the air to create a more stable, penetrating flight