Cultiwool Mini Slabs - Box of 36Overview Cultiwool Stonewool Mini Slabs are the highest quality growing medium on the market for hydroponic systems, providing optimal conditions for unrestricted and uniform root growth. Produced in Europe and certified by RHP, these stone wool slabs ensure maximum control over water and nutrient application, resulting in higher yields, superior crop quality, and reduced energy usage. General Information Dimensions: 250mm x 200mm x 75mm (10 x 8 x 3)