For the classic shredder in you... this is the 80's revisited. Clean harmonic highs and mid's with not too much on the bottom end. If you shred wearing a black T-shirt and like crushed skulls and blood, steel is for you. Heavy metal all the way! These new rollers are easy to change and will work on any CAM system as well as the old 2520 "Traditional" fulcrum system (shown below). Rollers are sold individually so you can order as many as you need.