This 29" Fiber-Optic Cable II from Sea & Sea is composed of 613 fibers (cores). Even when the cable is bent, attenuation of light is minimal. Therefore, the light signal will be transmitted to a strobe without loss. Compared to single-fiber cables, the Fiber-Optic Cable II is more resistant to distortion, bending and physical impact. It has 2 fittings for use with all Sea & Sea housings and strobes. The cable is not "one-directional". It may be used in any direction, meaning either end may be applied to the housing or the strobe. The FOC II is designed for the use of the new Internal Optical YS-Converter.