Sturdy shallow-rimmed injection-molded bottom trays with 1" of usable depth are a must-have for growing microgreens, and great support for pots and plug flats. More rigid structure than mesh-bottom trays. This black tray comes without drain holes, but you can also get them with drain holes in a variety of colors. Both styles have ribs to allow drainage beneath pots. Outer dimensions: 10¾x21".