Bootstrap Farmer's seed starter kits are built to last.  All components of the kit use durable materials so you don't have to worry about replacing your seed trays every year. A (1) Pack Kit Includes:  50 Cell Tray Clear Humidity Dome 1020 Propagation Flat Seed Tray (no holes) This 50 cell starter seed kit is a great way to get your plants started indoors.  We are so confident that this is the best seed starting kit that all of the components come with a 1 year warranty.  The 50 cell tray insert provides 1¾ square inches of growing room per cell.  This allows you to grow more mature plants before transplanting.  The tray inserts are 2¼" deep to allow you to bottom water your seedlings. Each seed starter kit comes with our 1020 Flats which are made from an extra thick Polypropylene plastic. These are built to last you a lifetime. Our 6" humidity dome, which comes with your seed starter kit is also built with the same quality as our trays. You won't find other humidity domes and propagation trays at your local garden stores built like these. Features: Will not warp, crack or break even during transportation filled with material Made from extra-strength recycled food-safe plastic Humidity Dome is 6" height, 5½" interior space Dome has two adjustable vents for controlling airflow 1020 Flat Outer Dimensions: 21¼” x 11¼” x 2.5" Outer Dimensions: 21¼” x 11¼”