The Walther Pro Colour Filter Set features a frosted durable plastic frame. Each filter has an individual socket, no change necessary!
Each glass filter disc has a special 1.5mm thick coating, and is mounted in a rugged polypropylene collar.
The Colour Filter set of four include red, blue, green and yellow. Functions include red to preserve night vision, blue for better detection of body fluids (blood, sweat, etc.), yellow for less glare in fog, green for game observation.