Rochling Industrial Cleveland Manufactures Duroprotect Ballistic-Resistant Composites Panels in Cleveland, Ohio, USA. We have been manufacturing here since 1946 and have been certified to UL-752 Levels 1, 2, 3, 4, 5, 6, & 8 fiberglass reinforced sheets in many size formats. Current stock is generally 3x8, 3x10, 4x8, 4x10, & custom, but also varies depending on the level required. Please contact us today for your next need. (less)