The Alpha Communications® model 3PRJ cable consists of three (3) twisted pairs, #22AWG solid copper conductors, non-shielded, with an overall PVC jacket. It can be used on a variety of different intercom and signaling systems. The cable shown is designed to meet the latest requirements for 'CM' type cable. Other types and style, such as 'plenum' cable are available on a special-order basis. Contact our sales department for more information on other wire and cable types.