thermal binding covers vacuum formed packaging custom binder slipcase software THERMAL BINDING COVERS We offer a large selection of thermal binding covers. Choose from several styles, colors, and sizes to accommodate 18 to 475 sheets of paper. Choose from a full-wrap cover or one with a clear cover on the front. Custom imprinting and window cuts are also available Thermal Binding Covers for a Variety of Binding Machines and Business Projects. Choose the Style, Color & Imprint for excellent presentations Please use the chart below in selecting a size for your thermal binding covers Metropolitan Loose Leaf has thermal binding covers for your thermal binding machine. Our binding covers will work with any thermal binder. Size measures the amount of thickness allowed for binding paper material. Standard covers have a clear front and grain back. They are pre sized to fit specific book thicknesses with a clean and finished look.