Grodan Gro-Block Improved Select Rockwool Type:GR4 Small w/ Hole, 3" x 3" x 2.5" - Case of 384 Grodan Pargro QD Biggie's are

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190 Micron

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Grodan Gro-Block Improved Select Rockwool Type:GR4 Small w/ Hole, 3" x 3" x 2.5" - Case of 384 Grodan Pargro QD Biggie's areNew and improved stone wool substrate with advanced wetting technology from Grodan Introducing Grodan Gro Blocks Improved, a product specifically engineered to deliver real results for your crops, developed by plant scientists, researchers, and top growers. A core component of the "Precision Growing" philosophy, Grodan Gro Blocks Improved with Advanced Wetting Technology allow you to cultivate more uniform and high quality crops while using less water