Features: The solar observation film is PET coated aluminumfoil, providing a durable and reliable solar filter for your telescope. With thicken film solar filter, you can safely observethe sun without reducing the contrast of the subject. Perfect for capturing sun spotactivity. The second generation solar film features a thick and bright silver coating on both sides. It meets theISO standard for solar filter film, ensuring eye protections during sun observation. Easy to clean,simply use a clean ragor paper towel, or wash it with water if it getsdirty. Wind and rain willnot affect its performances This solar filter is not only suitable for visual observation ofthe sun with the eye but also for astrophotography. Specifications: Border material: aluminum alloy Outer diameter of frame: approx 136mm/5.35in Film material: PET+aluminum foilcoating Supported size range: approx 104-130mm Luminousaperture: approx112mm/4.41in Screw: forM5-16mm Net weight: 119g Gross weight: 171g Package Includes: 1PC Film Solar Filter note: Due to the problems of lighting effectsand shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.