Vortex Diamondback HD Binoculars replace the original Diamondbacks with upgraded prisms and lens coatings. They are available in 8x28, 10x28, 8x32, 10x32, 8x42, 10x42, 10x50 and 12x50. The 42mm and 50mm models come with the Vortex GlassPak case and harness.