Vandoren Silver plated Optimum Ligatures offer quick and precise tightening and 3 interchangable pressure plates to adjust the sound, providing the player and a freedom of expression. Three Different Pressure Plates: Whether playing classical or jazz, the Optimum Ligature’s three pressure plates accommmodate your style. Plate 1…A rich, colorful sonority which produces great resonance. Pressure along the fiber of the reed facilitates an enbelievable plowing ease. Incredible ease of articulation. Plate 2…A more compact, cnetered sonority, smooth even sound and extraordinary blowing ease. Plate 3…The reed vibrates in total freedom, producing a very flexible sound. Greater ease of expression.