Scratch knives are the preferred tools for traditional scratchboard art. Made from high carbon steel, they're heat-treated to retain sharpness and plated to resist rust. Scratch tools are designed for sgrafitto techniques to produce lines and create terrific textures. Fits into most standard penholders. NOTE: In an effort to minimize damage during order packing and shipping, and to bring a higher level of customer service, some of these items are shipped in pack sizes.