TPS Louisville Slugger SB105E Catalyst End Load Slow Pitch Softball Bat. New TPS Louisville Slugger Catalyst is now available in a more end loaded swing weight. The Yellow Caddy revolutionized the composite bat industry and Louisville Slugger has now launched an end loaded red version of the original Catalyst. End loaded design adds more pop off the bat. Approved for play in ISF, ISA, NSF, USSSA not ASA Certified. New LS-2X Composite has thinner and high strength lightweight graphite fibers allowing TPS Louisville Slugger to reduce wall thickness and thus achieve greater barrel flex. While maintaining durability. Our new thinner walled LS-2X Composite material has higher strength lighter weight graphite fibers allowing Louisville Slugger to reduce wall thickness even using more layers of graphite creating better performance while maintaining durability. Thinner fibers allow the use of more layers in the barrel for added strength, but with an overall wall that is thinner.