Louisville Slugger FPXN161 Xeno Plus Fastpitch Softball Bat (-11) 31/20 FPXN161-31 199.95 Louisville Extreme POWER. Maximum POP. The #1 bat in Fastpitch softball bat is now even better with the Xeno PLUS featuring the NEW exclusive Performance PLUS Composite with zero friction double wall design, allowing the barrel to reach its maximum flex without resistance. The patented iST technology, 2-piece construction and patented S1iD barrel technology give the Xeno PLUS the right mix of undeniable power, a massive sweet spot, superior balance, and a lighter swing weight. Unmatched PERFORMANCE you can see and hear right out of the wrapper! Performance PLUS Composite with zero friction double wall design. iST technology. 2-piece bat construction. S1iD barrel technology. Balanced Swing Weight. 2 14 inch barrel. 78 inch standard handle.