Santo Angelo MUTE L 1.22 Inch 1/4-inch Right Angle to Straight Instrument Cable - 25 Feet 1 x 20 AWG Oxygen-Free Copper (OFC) Conductor Mechanical system plug: cuts off the signal, eliminating the problem of electrical switches, which create a noise and takes away some of its high frequency property. Entirely Shielded in Copper and Conductive Polymer