The frame is made of Aluminium alloy, durable and lightweight to carry. 1.25 inch 6.3mm plossl eyepiece, provide you the widest viewing field. Plossl eyepiece allow you to optimize the image quality of your telescope in a quick and easy way. Apply to watch scenery, celestial observation, nebula and so on. Fit for any 1.25 inch diameter telescope and astronomy filters.