neewer 12x12inches/30x30centimeters 4-color correction gels light filter transparent film sheet for flash strobe: red yellow green blue neewer <p><b>descriptions:</b></p> this color filter set consists of 4 -12x 12"/30x30cm gel sheets, (red, yellow, green and blue). <p>made of high light transmission materials with light weight, steady color temperature and low loss. </p> <p>mixing primary color filters are used for experiments involving additive and subtractive color, color mixing, color transmission, absorption and filtering of the different wavelengths of light. </p> <p><b>package contents:</b> </p> <p>(1) red color gel </p> <p>(1) yellow color gel </p> <p>(1) green color gel </p> <p>(1) blue color gel</p>