12x5 inch closed, 12x10.75 inch open. White inside and out (unlike the picture even on Camlin's site). Hinge is not overwhelmingly strong to resist abuse, but adequate for normal use. 12+8 1 inch wells on top edge of both halves, 4 2-inch wells on top half (wells are not slanting). Thumb hole (left hand) on top half. 4 3x4 inch and one 4x4 inch mix area. Brush tray 12x0.75, and 5 assorted holes for standing brushes. Very thick ABS. Total thickness 2cm, wells and mix areas about 8mm deep.