The Beard Wave Capo is machined from steel, which yields tone that is much crisper and cleaner than that of brass and provides a longer effective life. The mass of this design provides excellent sustain, and the contoured shape keeps the capo from interfering with your playing. The large precision tension knob ensures the capo in not too loose or too tight, is easily used with one hand, and will fit both 6 string and 8 string squareneck resonators.