This OMRI Listed 100% hemp product is made from fibers grown without the use of pesticides, herbicides or synthetic fertilizers. Puregrown hemp-felt is designed to transport water evenly throughout the entire medium and maintain a perfect ratio of water and air for the development of healthy root systems. Consistent growing conditions allow for consistent production of young plants. Just moisten and let excess water drain. Sprinkle seeds to the desired density, then mist. Mat is 3/16” (5mm) thick and great for microgreens and wheatgrass. Mats measure 9.5” x 19.5”.