Callaway Golf Warbird™ Golf Balls Two-piece golf ball construction High-energy core made of high-grade rubber and dense tungsten The Warbird™ has the highest core compression of any Callaway Golf ball High-compression core with a firm cover Designed to increase ball speed and decrease backspin with the driver, fairway woods and long irons for greater potential distance Firm ionomer cover is extremely cut-proof and scuff-resistant 12-Ball Pack href="http://www.thesportshq.com/ProductDetails.asp?PCLinkID=2350">