Biostrate Hydroponic Growing Mats - Pack of 10 - For 10" x 20" Germination Trays - Sure Biodegradable Felt Pads to Grow Microgreens, Wheatgrfass, More Pack of 10 - Pre-cut for 10"x20" Standard Trays - Holds the optimal amount of water Perfect medium for roots - pH balanced - Biodegradable No required additional treatment - Clean and easy to use - Light material Ideal hydroponic medium for microgreens, wheatgrass, microherbs & more