Srixon Golf Z-Star Pure White Golf Balls A great performing premium ball designed for players looking for a tour caliber ball at an a fantastic price. This durable 3 piece ball performs best with driver swing speeds greater than 85mph, & feels soft on all shots from tee to green. Proprietary, super soft urethane cover Optimal combination of distance & spin control on all shots Extremely soft feel on approach shots Great durability Elastic, very thin Ionomer middle layer Reduces excess driver spin for greater distance off the tee Dual, highly resilient, Energetic Gradient Growth core The extremely large core maximizes COR for greater distance 324 large dimple design with Invisiseam technology Reduces air resistance during flight for enhanced distance Exceptional spin control from tee to green