BARSKA 10x20 Blueline Compact Porro Binoculars Compact binoculars with 10x magnification and 20mm objective lens Sturdy all-metal body; BK-7 glass lenses with porro prism Folding rubber eyecups and right eye diopter adjustment Center focusing knob; includes neck strap and carrying case Compact body weighs only 8 ounces; limited lifetime warranty