5 sets of new solid-bottom plant trays and the  inserts to fill them. The flats are standard 1020 falts and measure 10.5" x 21". These are new seedling starter trays.  12 of these trays fill a standard 1020 (10" x 20") plant flat.  Each insert has 4 "cells" in it measuring 2 3/8" by 1 1/2" x 2 1/4" deep.  These are the same trays used by nurseries to grow bedding plants for sale by the flat.  I receive these trays in bulk and then break down the packages into smaller quantities.