MFG Tray 1105085116 Toteline Nesting Container, Seed Tray, Glass Fiber Reinforce Plastic Composite, 21.5" x 11" x 2.5", Slate Fiberglass-reinforced thermoset composite construction These seed trays are superior to plastic or fiber trays and will endure many seasons of planting Available in colors: white, slate and Green Works well with standard humidity domes Will NOT bend or twist while handling and will effortlessly withstand automated filling and handling