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This is a strip of six 4 in. x 4 in. x 2.5 in. Gro-Blocks, each with pre-formed holes. Stonewool is recognized the world over as an ideal hydroponics growing medium. Seeds or cuttings are started in these larger 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. Grodan stonewool is known for its quality, consistency and performance.