Grodan 4" sq. Rockwool Block - Stip of 6

Available Options: Case Upgrade: Case of 144 cubes(+$143.00) Grodan Rockwool is made from molten rock spun into cotton candy-like fibers and then compressed in to cubes, blocks, or slabs. These convient cubes can support small to medium size plants from start to finish. They are often used in comination with slabs.