Product Brief: This filter allow you view bright objects which are so intensely bright it`s very difficult to see it through a telescope without filter;You can really see the details Green red yellow blue four color filters fit for different bright objects;choose the filter which is the color the object you`re viewing is not;such as moon,jupiter,Mars etc Fits all standard 1.25 telescopes eyepiece and t adapter;thread inside tube Lens material;optical glass lens;provide clear image;frame material;alloy;light and solid material ensure a long term use Material: Metal frame + Optical glass lens Size: 1.25 inches (31.57mm) Screw thread: M28 * 0.6mm Metric Fine Thread Net weight: 9g This Filter fit allCelestron`s telescope Finally, it is recommended to choose metric fine thread(M28x0.6) if you unkonw your eyepiece specifications, The size of metric fine thread is slightly smaller, but can rotate a layer of double-sided adhesive in the metric fine thread filters, the same can be used. Package Include: 1pcs Blackx Sun Filter 1pcs Green x Moon Filter 1pcs Red x Nebula Filter 1pcs Blue x NebulaFilter 1pcs Yellow x NebulaFilter Caution: This black sun filter can not be used to watch the sun directly Very dangerous behavior! This filter is used to watch the clouds of sunrise and sunset. If you need to observe the sun, you must use the Bader film(Solar Filter), otherwise it will cause great harm for you