1、PREMIUM MATERIAL: Telescope eyepiece filter is made of premium optical glass and aluminum alloy, which is not easily damaged. 2、CLEAR PICTURE: Telescopes filter can be used normally after installation, the picture is clear without distortion, does not affect the observation screen. 3、APPLICABLE EQUIPMENT: Red telescope filter is suitable for 25in telescope eyepieces, which is professionally designed, perfect for observing planet. 4、EASY TO INSTALL: Telescope Moon Filter is easy to install. Align the filter thread with the rear thread of the eyepiece and rotate the filter into the eyepiece. 5、WITH STORAGE BOX: Telescope eyepiece filter is equipped with a storage case, which is easy to carry and storage, scratch resistant. 1 x Planetary Filter1 x Storage Box Item Type: Planetary FilterProduct Material: Optical Glass, Aluminum AlloyApplicable Aperture: 1.25in Telescope Eyepiece