4 Sheets of 200 Cubes Rock Wool Planting Cubes with Holes for soilless planting.

[BENEFITS OF USING ROCKWOOL]- Rockwool cubes are superior to other typical hydroponic substrates, with up to 96% porosity and 91% water-holding capacity allowing for free flow of nutrients, water and air, encouraging roots to grow deeper and wider. What’s more, rock wool increases growth rate and yield with a shorter planting period

[MULTIPLE GARDENING USES]- Growers like to use grow cubes for horticulture and primarily in hydroponic production, it is ideal for starting seeds, clone plants, growing vegetative and fruiting crops. Hydroponic growing medium is also suitable for different growth cycles of plants, both short and long-term, steer them towards flowering or fruiting growth

[SIMPLE USAGE GUIDE]- You need to soak hydroponic seed starter (its naturally alkaline) in acidic water until the pH value is stable between 5.5-6.5 for 24 hours, and take it out for use.