The SI series instrument cables are designed to offer exceptional audio performance, while providing the user with an extremely durable cable. Heavy duty G & H brand ¼” phone plugs are hand soldered to guarantee a perfect connection. The SI series incorporates our Q-2000 series single conductor audio cable. The Q-2000 series wire is designed specifically for use as an instrument cable; therefore, great attention was given to assure this cable would be as immune to mechanical handling noise as practically possible.