The automatic retractable cardboard cutter features a safety design where the blade retracts automatically after use. It has a magnet, allowing it to be stored on a refrigerator or workbench, preventing loss. It also has a key ring hole for convenient portability. 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 set of 2 (1 white and 1 beige).