GSO 1.25" Plossl Eyepiece - 4mm # GSP-04 1.25 inch 4mm plossl eyepiece, 52 degree apparent field of view Fully multi-coated lenses, 4 lens elements, Blackened lens edges 6mm eye relief, fold-down rubber eyeguard Threaded for standard 1.25" astronomy filters Weight 2.6oz., Made in Taiwan