Kodak Wratten Gelatin Filters & Lee Polyester Filters. Both are 3" square.

Wratten Features: Highest Optical Quality Kodak Wratten filters are fabricated as gelatin filters without a support base. The benefit of this feature is that it produces less optical scatter and lower D-min densities than other filters. Kodak Wratten filters offer the purest form of optical transmission, produce clean unbiased color reproduction. Lee's color correction filters are polyester based.