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4" Cubes Large Hole (1") 

Rockwool is a great hydroponics medium and has an ability to retain 10 times as much water and hold more than 15 percent air at all times also make it more favorable in any hydroponic systems.

Rockwool Grow Blocks are full-sized growing mediums for transplanting slightly bigger seedlings, with a couple of pairs of small leaves and good roots emerging from starter cubes.

The 3'' size is great to move plants on to your grow system or rockwool slabs.

We recommended that you soak the cubes in pH adjusted nutrient solution before use.