RedRock Rockwool 4" PRO Grow Block

RedRock Blocks stone wool blocks offer cultivators, propagators, and commercial growers the opportunity to grow more while using less: less water, less plant nutrients, and less growing space. Benefits of RedRock Blocks High fiber density High moisture retention Made from US derived raw materials Each block measures 4-Inch x 4-Inch x 4-Inch with a 42/40 Hole