Type/Packaging: 20 sheetSize: 8 1/2" x 11"You are purchasing one box which has 20 sheets.Each Sheet is 8 1/2" x 11"**Thermal Paper has 4 parts**1) Top layer is white. This is the layer that your image will be transfered onto. 2) Second Layer is not bound and is a milky white. Typically this layer is thrown away. 3) Third Layer is the Carbon (purple/blue paper). By pressing on this layer the purple/blue coating is transfered to the upper sheet. 4) Fourth bottom sheet is yellow and holds the original in place when using a stencil copy machine.