Convenient hydroponic planters, set of 4, for growing cat grass (Sizes) Rectangular Round: 2 pieces - 18.9cm x 12.3cm x 4.5cm Square: 2 pieces - 8.2cm x 8cm x 4.2cm (Features) Soil-free hydroponics Grows with water and light Compact, can be placed anywhere Easy to use (Instructions) Soak the seeds well in water, spread them evenly on the tray, being careful not to overlap, and add water to the inside of the box. With a double-layer independent design, you can take out the plants and add water directly. Changing the water daily will prevent the seeds from rotting, and the cat grass will grow quickly. Can be used not only for cat grass, but also for sprouting wheatgrass, mung beans, etc. Not only can cats eat it directly, but it can also be mixed into cat food to help promote the excretion of hairballs.