Rolled materials fed directly into the Cameo 4 without a mat can be advanced through the machine after the cutting process is completed. You can use the Crosscutter to trim your project after it’s done cutting, providing a straight leading edge on your rolled material for further jobs. This is a replacement cartridge set for the Crosscutter that snaps into the Cameo 4 to replace the original that is included with the Silhouette Cameo 4. It is offered in case the original may be require replacement. * Only compatible with Cameo 4 model. Not compatible with Cameo Plus, Cameo Pro, or any other Silhouette cutting models.