Demarini Voodoo Baseball Bat (-9) From the hottest fires forges the strongest metals: X10 Alloy. Time to turn up the heat and light up the scoreboard. X10 Alloy was designed with a proprietary In Chaos, DeMarini Found Strength: TR3 F.L.O. TR3 F.L.O (Fused Layer Optimized) Composite is a cutting edge formation of DeMarini's TR3 composite. Thie ain't no halo: Taper Ring Technology. DeMarini's Taper Ring Technology makes their bats just as mean on the inside as they are on the outside. As if it needed an exclamation point: Ion V End Cap. One of the finest ingredients in DeMarini's wicked potion, this end cap was designed for the aluminum barrels of the Voodoo line. Two different materials make up the Ion V End Cap.