Telescopic filter Aluminum case Anti-impact case Parts of the eyepiece filter Description: [Portable and protective] Aluminum storage box, shockproof, convenient to store and safe to transport. [Premium material] The telescopic filter housing is made of alloy materials, composite buckle, the use of stretching process, intelligent, convenient, strong to prevent the box from collapsing. [Durable] A suitable sponge case to store your camera and other photography accessories. [Function] waterproof, shockproof, mildewproof, dustproof. [Widely used] Widely used in aviation, outdoor photography, field research, scientific exploration and many other fields. Specification : Material: alloy Size chart: 7cmx6cmx13.5cm/2.76inx2.36inx5.31in The package includes: 1 piece box of telescopic filters