It's there to keep the bone from cutting through the wrapper, which would spoil the meat.
Floppy Disk
Its called a floppy disk.
The plastic bit
The purpose of the plastic (or metal) shutter on a floppy disk is to keep dirt off of the magnetic medium when it is not being read.
The plastic disk would float on top of the water but sink below the layer of oil in the glass container. This is because the density of the plastic disk is in between that of water and oil.
Hamn is a plastic pink pig piggy bank.
the plastic box the a CD is in ---------------- Actually, a disk cover is a liner [tray insert or label] found at the front or back of a jewel case [the plastic box a compact disk or DVD is in].
Optical disk
floppy disk
its made out of a plastic substance with a layer with paper for the cover
A plastic disk with digital information etched onto it.
Floppy disks generally had the following makeup: - A thin, plastic disk that went practically all the way to the edge of whatever casing held the disk. - A center hole made of firmer material than the disk itself that was used to move the disk in a circle as data was written to and read. Earlier designs were plastic, while later designs were metal. - A thin coating of iron oxide on the inner plastic disk, on one or both sides (single density or double density), which "permanently" holds a magnetic charge if a strong magnet is placed near it. - A rigid plastic outer shell to protect the flexible inner plastic disk (the reason they were called "floppy disks"). - On later models, there was a spring loaded metal sheath over the disk's main opening, which helped prevent dust buildup. - Also on later models, a cotton-like substance was included in the disk's interior on both sides to help remove dust as the disk was spun. - A small plastic tab (a sliding switch) was available on some floppies; when set to a particular position, the disk's drive controller would refuse to write data to the disk, making it "read only." So, basically, a few bits of metal, a few bits of plastic, coated with some more metal, and a bit of cotton for good measure.