Apollo Horticulture Set of 2 Germination Seedling Seed Starter Trays with Humidity Dome 2 - Apollo Horticulture Seedling Starter Kits Dimensions: 21.25 72-cell Seedling Inserts with 2 vent points for optimal airflow Controls humidity under a 7.23 Package Includes: 2 - Dome Covers / 2 - Seedling Trays / 2 - Water Trays