You should enter the exact size of your picture in millimeters.
The mount will be 2mm smaller all round to ensure it overlaps your picture slightly.

You should enter the exact size of your frame in millimeters.
This should match the glazing/backing size of the picture frame.

Select your mount colour from the colours on the left.

Snow White Ivory Magnolia Mushroom Omar Brown Baghdad Brown Silver Grey Lavender Dark Grey Pale Green Mid Green Bright Green Newbury Moss Dark Pink Terracotta Red Sun Football Red Beaujolais Maroon Mid Blue Royal Blue Dark Blue Imperial Blue Black