Seedling Starter Trays, 720 Cells: (120 Trays; 6-cells Per Tray), Plus 5 Plant Labels 720 cells, (will ship as 120, 6-celled trays). Equivalent to ten 10x20 "flats". Each cell measures 1.5" square by 2.25" deep. Ideal cell size to transmit room temperatures for optimal root growth. Includes five plastic plant labels! (5" long). Drain holes at bottom of each cell.