Scraper Knives Set of 4 - Use with Scraperboard to give a wide range of effects. These knives are used like nibs in a penholder. No. 1 Cutter gives medium to fine lines. No. 2 Cutter gives medium to broad lines. No. 3 Cutter is useful for producing small dots and circles when spun vertically between the fingers to lightly drill the surface. No. 4 Cutter for clearing large areas and broad single shapes. Use ink to add details and "block in" areas on White Scraperboard.