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 40
Hole Size: Pinhole
Cubes are in plastic trays
There are 77 cubes in each tray.