720 Cells Seedling Starter Trays for Seed Germination +5 Plant Labels (120, 6-cell Trays) Does not deliver on Saturday, Sunday or Monday. 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. 720 cells, (will ship as 120, 6-celled trays). Equivalent to ten 10x20 "flats".Each cell measures 1.5" square by 2.25" deep.