Compatible For those using telescopes, these eyepiece guards offer a combination of protection and enhanced viewing capabilities. The adjustable polarizing lens for astronomy allows you to manage light levels effectively, reducing glare and improving image quality. Simply attach the guards to your telescope eyepiece, and adjust the filter to suit your observation needs, ensuring a comfortable and clear viewing experience. Features -Color:Black -Material:Rubber -Size:4.00X4.00X1.60cm/1.57X1.57X0.63in -Sturdy rubber construction: made from sturdy rubber, these eyepiece guards are both durable and comfortable for extended use -Light blocking: these guards effectively block out unwanted light, protecting your eyes from glare and enhancing your viewing experience -Impact resistant design: built to resist impacts, these eyepiece guards offer additional protection for your eyes during telescope use -Adjustable fit for celestron: specifically designed to fit telescopes, these guards ensure a practical match and seamless integration -Simple installation: these eyepiece guards are easy to install, allowing for setup can focus on your observations Package list: 2pcs x eyepiece eyecups