Grodan Delta 3" can be placed in a tray (flat) without support for easy transplanting of cuttings from cuttings. They are individually packaged to minimize algae growth. Each block has virtually identical density, flexibility and strength, ensuring even distribution of water, EC and pH to produce a uniform, high-quality plant. This promotes the development of a strong root system during propagation. The uniform distribution and vertical fiber structure results in the same strength for each root, ensuring that roots are evenly distributed throughout the block.