Specification Brand : QANYEGN BulletPoint1 : ALUMINUM ALLOY: Our filters are made of aluminum alloy, which is strong, sturdy and wear-resistant, ensuring long-lasting performance even under harsh astronomical conditions. BulletPoint2 : NANO COATING SYSTEM: With the advanced nano-coating system, the film layer of the filter is resistant to high temperature and peeling. This ensures the uniformity of the coating, which improves the durability and performance of the filter. BulletPoint3 : EFFECTIVE: Our astronomical telescope filters can effectively eliminate the harmful light in the city, allowing you to enjoy a clearer and more detailed view of the celestial bodies. BulletPoint4 : COMPACT AND PORTABLE: Our astronomical telescope filters are conveniently designed with compact size and lightweight structure, easy to carry and transport. This allows you to enjoy stargazing anytime and anywhere. BulletPoint5 : UNIVERSALITY: The filters utilize international standard discussion threads, which are compatible with a wide range of astronomical telescopes that utilize the British thread standard. Simply align the filter threads with the rear threads of the eyepiece, rotate the filter lens into place and start observing. Color : Purple1 ExternallyAssignedProductIdentifier : 7605893074409 ItemName : QANYEGN Filter Light Pollution Inhibition Lens, Astronomical Telescope Filter, UHC Telescope Filter for Astronomical Components ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 8 centimeters ItemPackageDimensions_Width : 7 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : telescope-filters Manufacturer : QANYEGN ModelNumber : QANYEGNkf5wuzq974 PartNumber : QANYEGNkf5wuzq974 ProductDescription : Specification: Item Type: Astronomical Telescope Filter Material: Aluminum Alloy Color: Black Size: Approx. 31.7mm/ 1.25 Inch Weight: Approx. 27 g Application: Universal for astronomical telescope