4 Inch Rockwool Cubes PRO Grow Block for Hydroponics , 6 pack W/Holes, Rockwool Cubes Hydroponic Grow Media

Each Block is 4" x 4" x 4" with a hole at the top Each Block holes are the perfect size for any 1.5" Starter plug or macro plug Plants can be fully grown in these Pro-blocks The bases of the Pro-blocks are grooved to promote drainage and to avoid "wet feet" Inorganic & Sterile Growing Medium, great for Rooting Cuttings clone plants, germination start seeds and more. Encourages Faster Initial Rooting & Its Firmness Is Guaranteed Provides 20% Air Space When Saturated – Absorbs nutrient solution while retaining plenty of oxygen for rapid root growth ! Much easier than starting in soil! Predrilled planting holes make seeding and plant propagation a breeze. Great for hobby and commercial growers Perfectly-sized to fit a standard flat growing tray. Packaged in bulk to save you money. 4 Inch x 4 Inch x4 Inch Rockwool Cubes Hydroponic, 6 pack w/holes, Rockwool Cubes Hydroponic Grow MediaPRO Grow Block,  Rockwool Cubes, Hydroponics