The UNI-SLAB combines all the benefits of our traditional slabs with the versatility of a block. Great stability for any size plant. The UNI-SLAB is completely wrapped, thus keeping all the roots of your plant safely contained within the slab, protected from light and outside contaminants. Yet it's small enough to be maneuverable, allowing your plants to be spaced as the plant canopy requires. The UNI-SLAB is suitable for both top drip and flood systems."