GRODAN MM PM 40/40 Wrapped Rockwool Propagation Cube – 40 x 40 x 40mm Achieve consistent and vigorous root development with the GRODAN MM PM 40/40 Wrapped Propagation Cube, engineered for professional-grade seed germination and cutting propagation. Measuring 40mm x 40mm x 40mm, each cube is precision-wrapped to maintain structure and moisture balance, making it ideal for hydroponic systems and soil-based setups. Key Features: Dimensions: 40mm x 40mm x 40mm – compact and uniform Material: High-quality Rockwool spun from natural basalt and limestone Structure: Wrapped for enhanced durability and moisture retention Drainage: Pre-formed hole for easy seeding and optimal aeration Compatibility: Integrates seamlessly with Grodan blocks, slabs, or other media Benefits: Promotes downward root growth for stronger transplants Maintains ideal air-to-water ratio to prevent root rot Sterile and inert—free from pests, pathogens, and contaminants Suitable for hydroponic, soil, coco, and aero systems Easy to handle, soak, and transplant