The First Chair grey is a 1-layer economy priced AcoustaGrip CELLO Pad.
The Maestro White is a 2-layer AcoustaGrip CELLO Pad
The Virtuoso Red is a 3-layer AcoustaGrip CELLO Pad
The Virtuoso Red Contour is a 3-layer AcoustaGrip CELLO Pad - with a graduated thickness