Set of 4 Hoya 55m Filters. These were part of my father's camera gear and are all in superb condition.

Descriptions below are from Hoya site:

82A Color Correction

Cools color temperature (200°K) to help balance warm lighting conditions

85A Glass Color Conversion Camera Filter

Converts 5300°K light sources to match 3200°K balanced film

80B Color Conversion

Converts 3400°K light sources to match 5500°K daylight-balanced film

Cross Screen (CS) Filter

The most popular artistic filter to create dramatic 4-cross flare effect.

HMC 25A - Red

Dramatic increase in contrast, Useful for landscapes and clouds - blue skies become nearly black