Scratch Art Scratchboard Tools Scratch-Knife Curved Edge (For Scratchboard) The preferred tools for traditional scratchboard art Choose from seven sharp, high carbon steel scratch tools designed for sgrafitto techniques Create terrific textures expand drawing and design possibilities, heat treated to retain sharpness, plated to resist rust Sk3 Through Sk8 Are Designed With Innovative Angled Bend For More Effective Scratching Fits into ScratchArt and most standard penholders