Our Windowsill Humidity Tray is ideal for small orchids, african violets, oxalis, abutilons and other small tropical plants that need extra humidity to grow and thrive. Plants sit on a grid platform and excess water pours into the tray below. Water will evaporate and generate humidity around the plants. Made from black polystyrene. Measures 26 1/4” L x 6 1/2” W x 2 1/4” deep. The base of the tray measures 3 1/2”W so it fits on most windowsills.