Get gardening with the Viagrow Extra Strength Propagation Trays with Tall Dome. These are very thick and durable seed starter propagation trays measuring 10 x 20. Outside dimensions 21 in. x 11 in. x 3 in. with 7 in. tall propagation dome. The Viagrow quad thick extra strong propagation seedling trays and domes are reusable BPA free and built tough for long lasting durability. These super strong trays are great for fodder, wheat grass, micro greens or general seed starting and hydroponic use. They are 4 times the thickness of regular 10 x 20 trays so save money and buy it once. If a 72 insert is needed please see product number V726220; for additional tall domes please see product number VTD300; for additional Quad Trays see product number V726298. This is a 5-pack propagation tray kit.