Louisville Slugger Z-2000 End Loaded USSSA Slowpitch Softball Bat SBZ215UE (34-inch-27-oz) : The Z-2000 Balanced USSSA is back and ready for the 2015 season! Included with the 2015 models are the same features that made this bat a legend. Unlike our competitors, iST offers a solid connection between handle and barrel, providing a solid feel and larger sweet spot for maximum performance. Our thinner high-strength and lightweight graphite fibers allow us to use more layers in the barrel for added strength, while reducing overall wall thickness