The Rosco Opti-Flecs 9106 Powder Frost LED Filter is a light frost diffusion that reduces light output -.5 f-stops while evening the light beam and softening light source. Similar to Opal Frost diffusion. Sheet size of 11.81" x 11.81" fits most 1x1 LED light fixtures including LitePanels 1x1 and LitePanels Astra. Filter can be cut and trimmed with matte knife or scissors for a pefect fit with other size lights. Great for color correcting architectural LED lights. The semi-rigid panel can be used without a color frame in most instances. Thickness: 10 - 13 mil. Designed for use with low heat LED lights only.