PEC*PADs are extremely strong, lint-free and pure (99.999%) that it is almost impossible to scratch an emulsion with them. PEC*PADs are so soft that they can be safely used to clean all types of sensitive surfaces: Scanners, CD's, mirrors, lenses, telescopes, etc. When PEC*PADs are used with PEC-12 (sold separately), they are ideally suited for cleaning photographic film and print emulsions.The 4 x 4 inch (10 cm.sq.) wipes are perfect for cleaning 35mm and other small areas. Each package contains 100 Pec Pads.