The Derwent Craft Knife is perfect for sharpening pencils & cutting paper but it can also be used to add textural interest to your work. Use the craft knife to scrape the colour core of the pencil over a pre-wetted area. The knife can also be used to impress lines into your paper before applying colour. This is an ideal way of creating veins on leaves or whiskers on animals. The Derwent Craft Knife comes on a blister card with 5 replacement blades as it is important to change the blade regularly as a blunt blade will tear your paper and damage your pencils.