Store brand glossy black handset cord. We have sold hundreds of thousands of cords by this manufacturer. We buy them by the pallet, passing the savings on to you. They are made in China (like nearly all handset cords) and have gold plated contacts. They are lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE free.
This cord works on any phone with a modular connector. Some trimline phones over 30 years old used a special cord that requires a tool to replace. Other phones over 30 years old used hard-wired (aka spade tip) cords. If your cord simply "clicks" in place, this cord will work fine.
Length: The maximum practical working length of this cord is 5 feet (1.5M). Coiled (relaxed state) this cord is about 14 inches (35cm) long, NOT 9 FEET. Add a little more for the uncoiled portion on each end. It is called a 9 foot cord because 9 feet of material goes into the curling machine. This naming scheme is confusing but it's the standard.