Description: Material: The solar film has is made of PET and aluminum foil material, which boasts high prcticalty and can be used multiple times, providing long term protectionMultifunctional Design: This telescope solar filter film is not only suitable for observing solar eclipses, but also for observing sunspots and other solar phenomena, providing a clear viewing experiencePortable and Easy to Use: The thin film design makes it lightweight and easy to carry around. You can observe the sun anytime without being restricted by the locationClear Imaging: Solar eclipse telescope filter provides high definition imaging of the sun, making observation more vivid and delicateWide Application: The telescope filter can be used to make homemade eclipse glasses, camera filter, telescope filter, etc., suitable for both professional and amateur astronomy enthusiasts Specification: Material:PET,Aluminum Foil Size Chart: Inner Diameter:19cm/7.48inchMembrane Diameter:12.5cm/4.92inch Package Includes: 1x Telescope Solar Film Note: Please allow slightly errors 1-2cm differences due to manual measurement.