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A pen knife is a small, sharp-bladed cutting tool used for a variety of tasks, including paper cutting. It is typically used for making precise cuts and trimming paper or other thin materials. The blade of a pen knife is usually retractable, with a handle that can be easily gripped in the hand. The blade itself can be made of a variety of materials, such as stainless steel or carbon steel.When using a pen knife for paper cutting, the user typically holds the paper in one hand and the knife in the other. The knife is then used to make small, precise cuts or slices in the paper, allowing the user to trim the paper to the desired size or shape. This can be particularly useful for artists and designers who need to create intricate designs or cutouts in paper.Pen knives can also be used for other types of cutting tasks, such as cutting cardboard or thin plastic. They are a versatile tool that can be easily carried in a pocket or pencil case, making them a convenient choice for anyone who needs to make precise cuts on the go. However, it is important to use caution when handling a pen knife, as the blade is extremely sharp and can cause injury if not used properly.