NOMINAL SIZE: Tiles can have slight size differences depending on their batch, nominal size refers to the common size of the tile.
FACES: Faces refers to the amount of different patterns and colours across the individual tiles in an item. The number of faces can vary from one on basic tiles to 30+ on premium ranges.
GRADE: The grade of the tile refers to its suitability for different surfaces. Grade 1 is wall only and grade 2 through 5 are suitable for light residential foot traffic through to heavy commercial foot traffic.
SHADE VARIATION: Shade variation is how varied the colour and patterns between faces of a tile. It ranges from V1, little variation between pieces to V4 which is substantial variation between colour & pattern.