1.25"/31.7mm Telescope Eyepiece Lens Color Filter for Moon Nebula Planet Sun This product is made of material. It comes with general standard inch thread, suitable for most telescopes. Easy to install and use, a good choice for you. Features: Made of aluminum alloy and optical glass, this product is sturdy and durable. It can reduce eye strain and improve contrast and surface detail of the planet. Comes with general standard inch thread, suitable for most telescopes. Suitable for enhanced views of the Moon, Jupiter, Mars, Saturn, star cluster, nebula, deep sky, etc. (Red/Yellow/Blue/Green nebula filters can not be used to observe the sun.) Easy to install and use, a great choice for astronomical telescope lovers. Specifications: Condition: Item Type: Telescope Lens Filter Material: Optical Glass + Aluminium Alloy Color: Red/Yellow/Blue/Green/Black Transmittance: 83% Thread: Inch Thread (Fine Thread) Size: Approx. 31.7mm / 1.25inch Weight: Approx. 46g / 1.6oz Package List: 5 * Telescope Lens Filter Note: 1. Black filter is used as a solar filter. Don't use it when the sun is particularly strong. 2. Red/Yellow/Blue/Green nebula filters can not be used to observe the sun.