Features:The filter will fit all standard sized 1.25" eyepieces and accessories.Reduces glare and improves definition so you can see the moon's features.A high quality eyepiece filter for reducing the brightness of the moon and improving contrast and surface detail.A moon filter really makes a difference and at such a low cost is a must for every astronomer.Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly. This contrast-enhancement effect is particularly apparent on nebulas.Specification:Brand: DatysonCondition: Brand NewLens Material: Optical GlassFrame Material: Aluminum AlloyLens Color: Light PurpleShell Color: BlackBarrel Diameter: 31.7mm / 1.25inThread: Standard M28*0.6mmWeight: Approx. 17gPackage List:1 * Moon Filter1 * Storage Case