Gibson Gear Cab12-BL 12-Feet Instrument Cable, Blue The Gibson cables have a plastic conductive carbon shield and oxygen-free copper center conductor. Along with that it has an oxygen-free tinned copper grounded braid shield Each Gibson cable has a rugged brass knurled insert with a shrink tubing insulator. They also have the pure copper tip and 24K Gold-Plated Silent 1/4' connector sleeve.