The replacement blade is designed to fit into the blade drive housing (sold separately). It cuts through thicker and thicker materials such as balsa wood, leather, passepartout, foam rubber, criCut particle board and much more. The premium carbide steel blade makes clean, precise cuts child's play. For more information on blade calibration, cutting mats, materials, and more, visit help.cricut.com/knifeblade.Important: Due to longer cutting times and the required Bluetoothconnection, projects using the knife blade are not compatible with iOS and Android devices.For the desired cutting result, you should always disable the sleep mode of your computer before cutting. If the Bluetooth connection is lost (WAS occurs when the computer goes into sleep mode or is out of range), you may need to restart the operation completely.The knife blade replacement set contains:1replacement blade1Safety change cap1How to replace the bladeThis text is machine translated.