DeMarini 2015 Insane BBCOR Baseball Bat Low Profile D End Cap is scientifically tuned to absorb vibration while maximizing power and keeping swing weight low Hybrid Comfort Grip 2-piece grip built for ultimate comfort and tack SC4 Alloy constructed with proprietary aluminum extrusion provides a thickness-tuned wall that creates a wicked sweet spot Rotation Index (Numerical system) reminds players to rotate bat extending its life Made in the USA, BBCOR Certified and 12 month limited warranty