The Imperial Slate Floor Tile comes in the following size 30 x 30 x 1-1.2 cm and retails for £3.25 per tile.

The Multicolour Slate floor tiles comes in the following sizes :-
30 x 40 x 0.8-2.5 cm at £5.35 per tile
30 x 30 x 0.8-2.0 cm at £3.70 per tile

The Pale Classic Quatrz floor tiles are available in the following sizes :-
30 x 30 x 1-1.2 cm at £4.61 per tile
40 x 60 x 1.3-1.6 cm at £13.15 per tile

The Silver Blue Slate floor tiles come in the following sizes :-
40 x 60 x 0.8-2.5 cm at £12.00 per tile
28 x 40 x 0.8-2.0 cm at £5.73 per tile
20 x 30 x 0.8-2.0 cm at £3.11 per tile