Specifications:Brand: NITECORE Flashlight FilterModel:NFR34 NFB34 NFG34 NFD34Diameter:34mmColor:green，red，blue，whiteWeight:110gUnit Type:piecePackage Size:30cm x 30cm x 30cm (11.81in x 11.81in x 11.81in)Features:Blue light is helpful in finding blood trails.In fact homicide detectives often use blue filters to check crime scenes for bloodRed light is helpful in keeping your pupils dialated while using a lightIt will help you to keep your natural !#!amp!*!quot;night vision!#!amp!*!quot;.It is also useful in moving to and from hunting areas in the dark without spooking game.As deer cannot see the red light spectrum.Suitable for the flashlight with head of 34mmFeature premium double-sided mineral coated glass lens with heat resistance.High light transmission.Package Includes:1x Nitecore 34mm Filter(either red，green or blue or white，depending upon your selection)