During the extensive testing by Acoustica Grip, artists as well as instructors and students agreed that this shoulder pad is an innovative product for cello. ;Fits for 4/4 to 1/2;The Acousta Grip CELLO pad offers great comfort and a beautiful design;Can be attached and removed easily ;Can easily be stored in a case or bag;Protects the cello against perspiration damages;Prevents slipping;Allows the musician to feel the natural vibrations of the instrument;Increases the sound volume;This model has an additional 3rd layer;With all the features like above plus the 3rd layer the pad has an increased moisture absorption and provides additional comfort;Difference to Virtuoso in colouring alone;White;