From the back of the box:
Dungeon Floor Plans are a specially designed role-playing fame aid for adventures using 25mm figures.
Contains 12 coloured sheets of card with a superimposed square grid as follows:
- Six sheets representing stone/dirt flooring for passageways
- One sheet representing wooden surfaces
- Four sheets representing flagstone flooring for Rooms
- One sheet representing Stone Stairs
Each sheet is to be cut up by the user using a sharp knife.
(Description taken from the 1982 version)