This is a very nice quality set.  Heavy rubber desk mat with solid oak ends.  The mail box is dove tailed, and can be used for all kinds of organizing. For me it was my to do box.  They don’t make them like this anymore.
Desk Pad measures 18 x 29 3/4″
Mail Box measures 12 1/2 x 10 1/4″
Letter Holder measures 6 3/4 x 3 1/2″