Cartridge rolls are a tightly wound abrasive that come either straight or tapered and are unique in that they are wound in a way to expose new material as the old material wears out. They work great for getting into hard to reach areas that larger tools can't get to. They are used for grinding, deburring, blending, polishing and finishing and come in a number of different grits depending on the application. They are made from aluminum oxide for increased wear life.