You are purchasing a used FileMaker Pro 16 license key card for Mac and Windows.  The card contains a FileMaker Pro 16 serial number.  Along with the key card, the shipment will also include direct download links which give you the ability to download the full software installation (Mac or Windows) in any language FileMaker supports.  Make sure this product will suit your needs because it cannot be returned.  Please feel free to ask any questions.  Trackable shipping is FREE via the US Postal Service.