I've used these for a couple years now. They're roughly the size of the 1.44mb floppy discs. They fit into a shirt pocket easily.Now that so few computers come with floppy drives these are great when you need to share data, pictures, want to give someone a small sample of your recorded voice either reading or singing. For those who can remember how great floppies were when you wanted to share 1.44 mb of stuff... well these are great when you'd like to share 210mb with friends.