Willstar 1.57" x 1.57" Mini Blocks Rockwool Cubes Hydroponic Grow Media Sheet of 48 Plugs Rockwool Plant Seed Starter Plugs

The melted rock is spun into cotton candy-like fibers and then compressed into cubes. Improved homogeneity, and optimal robustness and flexibility. Clean and environmentally friendly, easy to use, ventilated, ideal air-water balance. Maintain moisture while providing good ventilation for healthy root growth. Improved homogeneity. An excellent choice for soilless cultivation.