Francois Louis Pure Brass, fits for boehm bass clarinet mouthpieces, brass braces, single top screw for a great comfort of use, solid brass pressure plate provides more resistance and a centred resonance, the longitudinal Contact with the mouthpiece by brass resonators and rolls guarantees free vibrations of the ensemble reed / mouthpiece, the pressure plates set of the original "Ultimate Ligature" can also be used with the "Pure Brass Ligature", brass, incl. plastic cap