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RedRock Grow Block PRO, 6" x 6" x 5.3" (Case of 48) Commercial Lighting The design consideration for theRedRock Grow Block PRO, 6" x 6" x 5. 3" (Case of 48) Dimensions: 42 40 Hole 15x15x13. 5cm Commercial grade stone wool pro starter blocks sourced and manufactured in North America. Our Stone wool is made in the USA Wetting agent ensures nutrients are immediately plant available The high fiber density of the stone wool starter blocks makes better use of water and fertilizers while allowing dry back Our stone wool starter blocks are priced for commercial