Make that old Apple Macintosh smile again!! Your old Mac giving you the question mark floppy error? Maybe you acquired a vintage Mac that didn't come with any disks... Or maybe the hard drive has gone bad (very common these days!).
These disks are what you need to get the system booted again and reinstall the operating system to a hard drive. This is a 4-disk installer set, and are newly written onto high quality 2D/DD floppy disks.