Selens 15.8X19.7inch/40X50cm Gels Color Filter Paper Correction Gel Lighting Filter for Photo Studio Light Red Head Light Strobe Flashlight with 4 Wooden Clips Blue 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. Package include:1*Blue Filter Paper,4*Wooden Clips