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Stonewool is recognized the world over as the ideal hydroponics growing substrate. 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 be planted directly into containers for soil gardening as well. This is a strip of eight 3 in. x 3 in. x 2.5 in. wrapped Gro-Blocks, without pre-formed holes. Grodan stonewool is known for its quality, consistency and performance.