81663 is a part of the Helukabel product line. It is an ethernet data cable of Cat7 Class F (class FA) quality, made with an SF/UTP (screened/unshielded twisted pair) copper conductors and a halogen-free sheath. The cable is gray in color, has 4 individually shielded twisted pair (UTP) cores, a maximum length of 138 meters, a temperature range of -20°C to +60°C, and a nominal voltage of 250V. It is suitable for data transfer from 10 to 1000 Mbps, including gigabit Ethernet applications. The cable has an AWG rating of 26/7, a stranded core construction, and a nominal diameter of 10 mm.