Music Direct recommended! Shakti On-Lines can be used on all high-definition interconnects, speaker cables and AC cords. 'On-Lines' attenuate the self-generated reflections, or ultrasonic ringing, that is characteristic of all cables placed between the various stages of an audio system. 'On-Lines' produce a blacker background that increases resolution and dynamics. They attach easily with integrated velcro straps to the mid-point of any cable. Dimensions: 3' L x 5/8' W x 3/8' H.