Specification Material: Polyester Film Thickness:0.057mm Size: 15.7x19.6inches/ 40x50cm Feature Color Correction Gels adds color effects to stage scenery and provides color correction for theatre, film, and television. Gel filters create a mood or effect by changing the color shade of a light fixture. CTO gel that warm up the lights in your shot. CTB gel for creating cool-lit effects and balancing tungsten lights. lighting gel can be used with LED, fluorescent, tungsten, halogen, and strobe lighting. This flexible color gels material can be easily shaped and trimmed to fit pin spots, gobos, and other light instruments. Lighting Color Correction Gels are made of Premium smooth and flat transmission material. Steady color temperature and low light loss. Package Content: 1x orange (full cto,1/2 cto,1/4 cto) 1x blue (full ctb, 1/2 ctb,1/4 ctb) Please Note Don't attach gels filter on the lighting source directly or it will melt. Use a proper gel holder, or tape the gel to the edges of the barn doors, away from the lamp, or cold down the light source after 30mins using the gels..