Combat Grifter Youth Baseball Bat -10 MCC (Mongrel Composite Construction) is used in the handle, which gives added durability and strength that is needed when using Titanium enhanced alloys for the barrel. RPT (Resonance Proof Taper), an ancient Combat secret, which, when combined with Gear Technology provides for zero sting and vibration in a two-piece bat. TEA (Titanium Enhanced Alloy) contains trace amounts of titanium and other elements to deliver incredible strength. GT (Gear Technology) has a special taper in the barrel, which provides a softer feel and greater performance. Approved for play in LLB, DIXIE, PONY, AABC, BABE RUTH, and USSSA.