Bresser Junior 6 X21 Binoculars. The binocular lenses and prisms are from optical glass material 6X magnification lens diameter 21mm rubber coated including nylon wrist strap and bag. From their double-pass tested optics and enhanced multi-layer deposition coatings, to their precision machined and hand-assembled components, you"ll experience high-contrast, high-resolution images with Explore Scientific"s full range of binoculars and digital microscopes. With Explore Scientific, you"ll find great performance and value that will keep you up at night.