EKO™ composite–engineered to the pinnacle of performance; light swinging, large barrel profile and optimized sweet spot. 1-piece construction for stiffer feel on contact and more energy transfer. Premium GT1™ end cap that improves barrel control and feel. Ultra balanced swing weight–for one of our easiest to swing SL models. Premium LS PRO Comfort Grip™ for the perfect mix of tack and cushion.