Keep a Certain Distance with the Filter and the Working Bulbs,or the Correction Gel Lighting Filter will be Melted or Deformed at the high Temperature or use in a long time. Description: High Quality--Made of High Light Transmission Materials with Light Weight, Steady Color Temperature and Low Loss. Multi-Function--Color Filters are Used for Lighting Effects and Color Correction, Involving Additive and Subtractive Color, Color Mixing, Color Transmission, Absorption and Filtering of the Different Wavelengths of Light. Flexibility--Use Combinations of these Filters to Create Different Effects. Widely Used--Colored Gels for Lights used in Film, Video, Photo, Stage, Theater, Party, and DJ Lighting. Specification: Dimension: 15.8X19.7inch/40X50cm Shape: Rectangle Package Contents: 1X Blue Filter Paper Note: Do not place gels directly on the face of the lighting instrument. Although gels are made of heat-resistant plastic, they do melt if there is not a small space between the gel and the light to let the heat escape.