Non face bricks, known variously as plaster, common or stock bricks, are supplied in two categories: NFP and NFX. NFP Bricks are suitable for general building work which must be plastered or rendered.
Bricks suitable for use, plastered or unplastered for general building work below damp proof course or under damp conditions or below ground level where durability rather than aesthetics is the criteria for selection.
These particular bricks have an uneven, textured finish to them, which gives them more of a rustic, or informal look. While each brick is the same width, the pieces are different lengths, and are placed in vertical rows that are not precisely straight. This gives it a more casual look with goes along with the rustic feeling.