537 - 4" x 6" x 1/2" Jade Rectangle.  Etch area 3" x 4.5" 538 - 5" x 7" x 1/2" Jade Rectangle. Etch area 4" x 5.5" 539 - 6" x 8" x 1/2" Jade Rectangle. Etch area 5" x 6.5"