10 sets of new solid-bottom plant trays, humidity domes and the inserts to fill them. The flats are standard 1020 falts and measure 10.5" x 21". These are new seedling starter trays.  The inserts allow planting of 72 plants per tray. 12 of these inserts fill a standard 1020 (10" x 20") plant flat. Each insert has 6 "cells" in it. 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.  The humidity domes measure 2.5" high nd allow for higher humidity levels to facilitate seed germination.