Grodan Gro-Block Improved GR10 Large with Hole, 4" x 4" x 4" - Pallet of 1584 Select Rockwool Type:GR6.5 Small w/ Hole, Unwrapped, 4" x 4" x 2.5" - Case of 216 1 pc Premium food grade

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Grodan Gro-Block Improved GR10 Large with Hole, 4" x 4" x 4" - Pallet of 1584 Select Rockwool Type:GR6.5 Small w/ Hole, Unwrapped, 4" x 4" x 2.5" - Case of 216 1 pc Premium food gradeNew 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