The Solo 617/618 is Louisville Slugger's newest edition to the BBCOR lineup. If this bat doesn't get you excited, we don't know what will. Constructed with the brand new SL Hyper alloy, this one-piece construction delivers a stiff feel for maximum energy transfer on contact with a ball. Where this design differs from the Omaha 517 is at the end. Slugger has invented the Speed Ballistic Composite (SBC) end cap for the absolute lowest MOI and quickest swing speed in their BBCOR line.