Just as its name suggests the Wolf Super Flexible Shoulder Rest is Adjustable in height from 1-1/4" to a full 3", The Wolf shoulder rests have long been favorites of professional violinists and violists. The rests feature a very sturdy design that grips the instrument tightly (will not fall off). The bar is metal with a foam rubber strip and can be tilt and tension adjusted to conform to the individual player. Fits 4/4, 3/4 violin and smaller violas.