These terms are used to describe how many
colours are printed on a piece of paper. A 4/1 piece is printed
in four colours on one side (ie full colour), and one colour on
the back (usually black). 4/4 means full colour on both sides.
4/0 means full colour on one side, and no printing on the back.
1/1 means one colour (again, usually black) on both sides.
A plastic clam-shell type case designed for
DVD discs to differentiate them from CD’s and protect them.
It is similar to clam-shell cases used for VHS cassette, but it
is wider and thinner.