This green and silver 13" Half Single Stainless Steel Wire Diffusion from Matthews is impervious to rust and holds up better under uneven, intense heat, making it preferable for use with open face, non-Fresnel lighting fixtures. The scrim is designed to reduce a portion of the beam and is used when the light is striking the plane of the subject or background at an angle. It does not affect the color temperature and can be stacked to achieve limitless variation of light intensity.