Grodan Pro Delta 6.5 Block, 4" x 4" x 2.5", case of 216, Commercial RWP96492 | Grodan

Grodan Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool, Grodan is unique by making differen