4″ Wide Replaceable Hard Amber Scrapers. Excellent for removal of RTV, sealant, adhesives, and non-skid tape from aircraft cargo bay floors. Will not damage alodine primer and metal or composite substrates. These AMBER hard plastic scrapers are for exterior surfaces. They are also listed and approved by AIRBUS, CESSNA, EMBRAER, LOCKHEED-MARTIN, USAF, US NAVY, US ARMY, US MARINE CORPS, etc.