1. Molten Rock Soilless Culture Substrate: Soilless culture substrate is made from melted rock, which is spun into sugar like fibres and then compressed into cubes to ensure long lasting performance. The soilless planting sponge (25 x 25 x 40 mm) is perfect for propagation in your hydroponic system. It supports the development of seedlings excellently while ensuring optimal humidity for germination. The special structure creates ideal conditions for root growth and plant settlement. 2. Good air permeability: Growth cubes have a low stacking density, light texture, high porosity and good breathability, so plants can breathe and grow ily. The light texture and high porosity allow easy penetration of the roots while maintaining sufficient moisture without waterlogging. The balanced water to air ratio of these growth blocks ensures your hydroponic garden seedlings thrive. 3. Strong water absorption: Bottomless cultivation substrate has strong water absorption and good drainage properties and provides a suitable environment for plant growth. Nutrient solution can reach roots through rock wool, which is beneficial for plant growth. The water absorption rate of quality is over 800%, and the water and fertiliser performance is good. Thanks to their excellent water absorption capacity and efficient drainage, these growing blocks ensure the ideal moisture balance of your plants. 4. Non toxic and sterile: After high temperature treatment, these growth starter cube plugs are non toxic and sterile and provide a and y medium for plant growth. Due to its clean nature, it is ideal for indoor gardening, hydroponic systems and professional growing operations where cleanliness is important.