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... eight 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 1.25Inch telescopes eyepiece and t adapter;thread inside tube Lens material;optical glass lens;provide clear image<br><br>Size:1.25 inches (31.5mm) Screw Thread: M28x0.6mm Thread 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 film(Solar Filter), otherwise it cause great harm . Color: Black Material: aluminum alloy<br><br>Package Contents: 8 * 1.25Inch Telescope Filter<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.