Features: Type: Rockwool Cubes Material: Molten Rock Size: (Optional) 25mm x 25mm x 40mm 36mm x 36mm x 40mm 50mm x 50mm x 50mm Quantity:10/5 Pcs Description: 1. Made from molten rock spun into cotton candy-like fibers and then compressed into cubes. 2. Improved homogeneity, and optimum robustness and flexibility. 3. Clean and eco-friendly, easy to use, ventilate, and good for air water balance. 4. Retains water yet provides good aeration for healthy root growth. 5. Great choice for soilless planting. Instructions: 1. Preparing and planting in rockwool cubes. 2. Soak in water for 2 minutes. 3. Take out from the water and place for about 15minutes. 4. Put seeds into the hole of cubes. 5. Spray water after seed inserted. 6. Place it in a seed tray. Notice: Due to the different monitor and light effect,the actual color maybe a slight different from the picture color. Please allow 2-3cm differs due to manual measurement.