A natural and sustanable hydroponic slab for blocks to be transplanted onto. Slabs are 40″” x 6″” x 4″” Terrafibre Slabs are a sustainable alternative to rockpool, peat moss, or coconut. Slabs are 100% biodegradable and compostable. The Slabs are highly absorptive. Hemp fibres can hold 1050% of its own weight in water, providing roots with the water they require. Terrafibre Hemp Growing Slabs are made in Canada.