D'Addario H-Ligature and Cap for Bb Clarinet D?Addario?s H-Ligature and Cap set is precision-crafted for ultimate playability. -Fits most hard rubber mouthpieces -Four points of contact apply equal pressure to the reed -Two-screw, inverted design for comfort and increased response -H-shape design based on famous Harrison ligature -Offered in gold plating for tonal warmth, or silver plating for tonal focus -Made of soft, over-molded plastic, the D'Addario mouthpiece cap is is virtually indestructible, fits snugly for optimal protection, and makes less noise when dropped