The Media's Ultra-Thin Fiberscopes represent the Premium line of Micro Fiberscopes. They are the best choice for extremely small inspection areas, with diameters as small as 0.37mm. All of the optics are tested and adjusted in the USA to ensure ultimate image quality. The advanced image bundle is composed of 3000 and up densely-packed microscopic quartz pixels or fibers. These Japanese fibers are small enough to provide a brilliant high-resolution image, which is not so small as to leak some light or resolution.