Rockwool Slabs are the premium product for vegetable cropping. They are available wrapped in UV resistant polyethylene sleeves for ease of use. The special structure provides a uniform environment allowing plant roots to rapidly explore all the available growing volume for a quick start. Water and nutrient distribution is also more uniform and provides a larger effective rooting volume than previously possible. The Slabs are easy to use just cut holes in the top of the slab set your cubes on top and cut a few slits in the bottom of the slab's plastic for drainage.