Rockwool Grow Cubes by Grodan - MM 40/40
1.5" X 1.5" X 1.5" Individually Wrapped. Sheet of 45 cubes.
Small cubes for seeds and cuttings.Plastic wrapped rockwool cubes guide roots downward. You can set them on top of other rockwool cubes / slabs or use other growing media like Silica Stones for the roots to grow into.