Shallow walls make for easy harvests and ridged bottom allows for optimal watering and drainage. Made from tough injection-molded plastic (BPA-free) that is easy to clean/sterilize and holds up to repeated use. Best used with a Reservoir Tray (#6797), sold separately, which holds water to aide in bottom watering. NOTE: Not compatible with standard 1020 flats, trays, or domes. Dimensions: 22" x 11" x 1 1/8". Quantity: 1 tray.