Penn Slammer IV DX Spinning ReelsPenn Slammer IV DX Spinning Reels The Slammer IV DX takes our class leading Slammer IV up a notch. We have incorporated our CNC Gear Technology, and have upgraded the material to ultra durable stainless steel for both the main gear and pinion to give best in class durability, all while retaining the smoothness you have come to expect. The additional bearing rides in the spool so the Dura Drag is dually supported, and we have included a spare Hypalon