Pindfresh Wheatgrass and Micrgreen Trays are long lasting ABS (Strong Plastic) trays, that are ideal to grow microgreens, wheatgrass, saplings for transplant and for many other versatile uses. Widely used in Hydroponic and soilless setups, these trays are made using the same super strong material that car bumpers are made of. These can be used for both top feeding (you water from the top) and bottom feeding (you provide the water UNDER the plants / microgreens)