6x6x6'' Rockwool Block: G
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The largest rockwool block made! Measures 6''x6''x6''. Capable of supporting medium-sized plants all the way through harvest. Grodan Rockwool is made from molten rock spun into cotton candy-like fibers and then compressed into convenient blocks that can support small to medium-size plants from start to finish. They are available in cubes, blocks, slabs and granulate.
Price: $2.47