The automatic retractable cardboard cutter features a safety design where the blade retracts automatically after use. It has a magnet, allowing it to be attached to refrigerators, workbenches, etc., for storage and preventing loss. It also has a keyhole, making it convenient to carry. It's useful in various situations, such as opening envelopes, paper, delivery bags, and cardboard boxes. Please refer to the image for the size. Comes in a pack of 2.