(4 PACK) Neutrik NP3X 1/4in 3-Conductor Phone Plug Nickel Contacts Nickel Shell... The X series heavy duty professional phone plug improves on the design of the existing C series by offering the thinnest available A-gauge 1/4" plug with unique Neutrik chuck type strain relief on the market. The slimline shell with a width of 14.5 mm meets the most recent requirements for highest density jackfields (15.88mm jack pitch). The precise machined one-piece tip contact without rivets makes it unique and avoids hook up in a socket or break off the tip. The X Series serves all applications such as guitar applications, audio cables, snakes, speakers, amplifiers and mixing desks.