Perfect for growing baby salad leaf greens, micro greens, sprout growing & more! The internal dimensions of each tray are 34.4cm x 21.2cm x 3.5cm & each tray can be stacked on top of each other to create a bottom feed/watering system with the drainage hole tray stacked on top of the tray without holes. This method is an incredibly effective way of growing healthy plants quickly & easily. Add water to the bottom tray, & the plants will take what they need as & when. Made from 100% recycled plastic. . Shallow Seed Tray Flats - Microgreens Sprout Growing Bottom Watering Feeding With Drainage Holes & Without 100% Recycled Plastic