The HD13 is essentially an I13 with incredible pop and terrific durability. The HD13 knob flares into the thin handle which then tapers up gradually to the barrel. The hitting surface is fairly large which loads the end a little more. Victus Grit Matte bats are made for grinders. Featuring the same quality wood as our Pro Reserve line, the textured matte finish gives these bats a unique look and feel and has been rumored to grip the ball, creating more backspin.