CocoTek Grow mats are made from a strong weave contain ing 100% organic coconut fiber weave containing 100% organic coconut fiber and natural rubber. Roots will thrive in this natural and natural rubber. Roots will thrive in this natural media. These mats can be easily cut to fit any size media. These mats can be easily cut to fit any size application. They are designed to lay underneath baskets, slabs and cubes. Roots will grow under mats where moisture remains in a hydroponic tray between flood cycles protecting them from drying out. The coco bricks are ideal for indoor or outdoor gardening, Coco-Tek is pH balanced, and contains the lowest known sodium content for coir fibre. It increases water holding capacity and nutrient retention, expanding to 5 times its condensed brick size (1 brick expands to 3-1/2 gallons). Coco-Tek can be mixed with any other growing media (Perlite, Grow Rocks, soil, etc.) to make the desired final mixture.