The Magenta Color Correction kit contains five of the most used densities of color correction - 05, 10, 15, 20 and 30. Color correction filters are used for color balance adjustments and are used single or in combination to change the overall color balance. Magenta color correction filters will absorb green, thus reducing or removing green casts from images. Color corrections are available in 8 different densities from 025 to 50. This 85mm filter kit is usable with Hitech 85mm holder systems or any 85mm (3.35 Inch/P Size) holder.