An ink jet recording head is provided with a flow path structure capable of enhancing the discharge power, filtering performance, and discharge frequency characteristics even with liquid droplets being made small. The peg hook support structure includes two mating bodies that are preferably substantially similar. The templates or order may be further comprised of components andor subcomponents which can be stored separately. The multi protocol system employing the RTP provides a single RTP control interface for transmitting and receiving audio packets to completely manage the system totally and raises a degree of resource utilization of the system by making it easy to implement additional functions to the RTP and coder through the buffers. The light sources positioned to the rear of the opening portions and the light sources positioned to the rear of the half-mirror portions provide an unexpected luminous intensity distribution. The illuminatable fishing line system includes comprises a line member having a core portion providing tensile strength, an outer portion providing abrasion and moisture protection, and an intermediate portion.