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Grodan Rockwool is a mineral wool made from molten basalt and limestone rock that is spun into cotton-candy like fibers and then compressed into cubes, blocks or slabs. Being made from natural rock, Grodan is a mineral based product used in hydroponic growing applications.
Cube Size: 36 x 36 x 40Hole Size: PinholeCubes are in plastic traysThere are 77 cubes in each tray.