Made of high quality aluminum alloy and optical glass, this product is sturdy and It can reduce eye strain and improve contrast and detail of the planet. Comes with general standard inch thread, suitable for most telescopes. Suitable for enhanced views of the Moon, Jupiter, 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.