The image is transmitted by a fiber-optic bundle. This is made up of a huge number of fine glass or plastic fibers. Image pixels are transmitted by individual fibers probes and are then re-aligned at the eyepiece to form the high-resolution image. Standard models include diameters of 4mm and 6mm with lengths upto 1000 and 2000 mm respectively Semi flexible endoscope length 1000mm and diameter 6mm. Flex and twist endoscope length 740mm and diameter 4mm.