Penn Slammer IV DX Spinning ReelsPenn Slammer IV DX Spinning Reels are going to blow you away! The Slammer has gotten a refresh and with the DX version you get even more! Penn took what was already a beast of a reel and took it to the next level. The reel is constructed of aluminum and the engineers at Penn worked their magic to reduce rotor weight making it easier to get the handle to start spinning. The main gear and pinion gear have been upgraded to CNC machined stainless steel