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 disk.