Feature: 1. Premium Material: Our rockwool cubes are made of premium basaltock inorganic fiber, and compressed into blocks through proprietary process. It's soft and even texture, good water absorption and strong air permeability, which is the best substrate material for soilless cultivation. 2. Easy to Transplant: Rockwool cubes for hydroponics keep the seeds long enough to establish a root system because of they have high water absorption while retain a lot of oxygen. This 1 in square rock wool block can hold its shape well without falling apart, making it easy to transplant. 3. Slotted Design: These net pots for hydroponics with holes at the bottom produces healthy roots with even drainage, allowing the roots to grow in their own way, passing through the net cup and emerging from the side to form larger and healthier roots. 4. Easy to Use: Cut off several pieces of rock wool with scissors, soak them briefly in nutrient solution for about 10 seconds, and adjust their EC and pH values to the required range for the seeds. The optimal pH for most plant seeds is about 5.5. Then control appropriate moisture, light, and temperature, when the root grows more than 1 inch beyond the rockwool, it's time to transplant then into new home. 5. Rockwool Cubes with Net Pots: Package comes with 72 pieces 1 inch plugs rockwool cubes, 50 pieces 2 inch net cups, 1 piece self watering cotton wick cord. This kit can help you to do soilless cultivation very well. Specification: Item Type: Rockwool Cubes with Net Pots Material: Basalt Inorganic Fiber, Plastic Weight: Approx. 634g / 22.4oz All Rockwool Cubes Size: Approx. 11.5x4in Single Rockwool Cube Size: Approx. 1.57x1.2in Net Pots Size: Approx. 1.9x1.9x1.3in. Package List: 72 x Rockwool Cubes72 x Net Pots30 x Label 1 x Rope