Redrock Rockwool 4″ PRO Grow Block for Hydroponics | 6 Pack + Twin Canaries Chart

Brand: Twin Canaries Liquid Volume Conversion Chart

Features:

• 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