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Gro-Blocks 4 in. x 4 in. x 3 in. DU8 (Stonewool / Rockwool) Grodan. Known for its quality, consistency and ease of use, high-performance Grodan stonewool is used by hydroponics gardeners the world over. Seeds or cuttings are started in these Grodan Gro-Blocks and, once rooted, the blocks are transferred to a larger stonewool slab. Gro-Blocks can also be planted directly into containers for soil gardening. This is a strip of six 4 in. x 4 in. x 3 in. Gro-Blocks, without pre-formed holes.30 strips of 6 in a case. Gro-Blocks 4 in. x 4 in. x 3 in. DU8 (Stonewool / Rockwool) Grodan