Otis Technology, Multi-Purpose, Scraper & Brush Set, 3 Piece Set, Black WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 2 all purpose brushes are composed of a stiff blue nylon 5 scrapers to remove caked on carbon and fouling Angled scraper, flat scraper, pick, bolt scraper, firing pin scraper Made in the USA Product Description Otis scrapers & brushes work hard so you don't have to. This 3 piece combo set is comprised of 5 scrapers and two all purpose brushes. These detailed scrapers cover a magnitude of cleaning - firing pins, bolts, chamber, slides, trigger group and more - with ease. Scrub hard to reach areas with the stiff nylon bristles or scrape fouling build up with the various scrapers.