Vandoren LC51GP M/O Ligature and Plastic Cap for Bb Clarinet (Gold Plated)The new M O ligature combines the lightweight construction of the legendary Masters ligature with the highly efficient tightening of the OPTIMUM ligature and allows an optimum vibration of the reed and a crisp articulation. Lightweight Easy to set up Quick and symmetrical tightening with a unique double track screw mechanism Inverted tightening with only two small contact points on the reed