Viagrow extra strength, very thick and durable seed starter propagation tray 10 in. x 20 in. tray. 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 in. x 20 in. 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.