Louisville Slugger Z-2000 Balanced ASA Slowpitch Softball Bat (34-inch-28-oz) : The Z-2000 Balanced ASA is back and ready for the 2015 season, and this time, it has a new stamp. Upgraded to the new 2013 ASA performance standard, your trusted ASA boom stick just got a whole lot better. 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. SWING 1 inner Disc Technology allows the barrel to flex to its maximum allowable performance from the first swing. That means you get a larger performing sweet spot right out of the wrapper.