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 dependable production of young plants. Just moisten and let excess water drain. Sprinkle seeds to the desired density, then mist. The 1300 mat is 3/8” (10mm) thick and is great for microgreens and baby greens. Mats measure 9.5”W x 19.5”L.