40'x100' 5.5mil Panda FilmThe Black and White Panda film measures 40'x100', and it is almost 5. 5mil thick. The 2 sides of the film are colored black and white, where the white part reflects almost 90% of light while the black shaded side does not allow penetration through light. The film is heavy duty and waterproof, so it doesn't allow mold and algae to grow. Reliable: 5. 5ml is quite thick, which means it won't rip apart or tear easily upon applying force and stay around