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Stone wool grow blocks are made in the USA
RedRock Stonewool grow blocks PRO are priced for commercial agriculture production
Stone wool has high fiber density makes better use of water and fertilizers while allowing dry back
Each block measures 4-Inch x 4-Inch x 4-Inch with 42/40 Hole
Comes with 6 4″ Redrock Rockwool 4″ PRO Starter Blocks and 1 Twin Canaries Chart