If you're planning to keep your gibson guitar for a while, it just makes perfect sense to buy your parts from sweet-water. By using only authentic gibson parts and accessories, you'll end up with a guitar that's going to maintain its value for decades to come. If you love your Les Paul, your ES-335 or ES-175, you'll be assured of having a guitar that will hold its value for dozens of years. Set of 4 gibson knobs 2 volume, 2 tone knob black with metal inserts.