Cultiwool 6" x 6" x 6" Blocks of Cultilene Rockwool with Optidrain - Case of 48Description Cultiwool 6" x 6" x 6" Block w Optidrain: These 48 Blocks per Case are brought to you by Cultilene. Recognized for their quality and efficiency, the Cultiwool growing blocks stand out due to the consistency of the products. They offer quick and easy uptake of water and consistent distribution of water throughout the substrate, a crucial feature of any effective growing medium. High Quality Stone Wool: Customers can expect top notch quality