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Grodan Improved Gro-Slab - (36x6x4") (Case of 12) Cloning Machines & Systems Bulk Packaging: This product isGrodan Improved Gro Slab (36x6x4") (Case of 12) Experience the pinnacle of cultivation technology with the Grodan Improved Gro Slab (36x6x4"). This state of the art slab has been meticulously designed, keeping in mind the intricate needs of both hobbyist and professional growers. Grodan's Unique Stonewool Composition: Unlike conventional rockwool brands that derive all sizes from a single wool batch, Grodan stands apart. We produce different fiber