Grodan A-OK 36/40 6/15 Starter Cubes, 1.5" x 1.5", 30 sheets of 98 Cubes

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• Grodan Stone wool (Rockwool) is made from molten rock spun into cotton candy-like fibers
• Designed for seed and cutting propagation prior to "blocking on" into larger growing blocks
• remendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth
• A-OK plugs come in a sheet that fits a standard 10x20 flat.
• Come in a full case of 30 sheets of 98 cubes