Cultiwool 8" x 8" x 8" Blocks of Cultilene Rockwool - Case of 18Description Efficient Cultiwool 8" x 8" x 8" Blocks: Cultiwool's unique growing blocks are efficient due to their consistency. These blocks are designed for swift and seamless uptake of water and homogeneous distribution of water throughout the substrate, critical characteristics of an effective growing medium. Superior Quality and Innovative Design: Not only is it sterling quality stone wool, but Cultiwool is also the first to introduce the 'donut