25x25x40mm hydroponic grow rockwool cubes soilless cultivation compress base

made from molten rock spun into cotton candy-like fibers and then compressed into cubes. after high temperature treatment, non-toxic and sterile. the bulk density is small, the texture is light, and the porosity is large. good air permeability, strong water absorption and good drainage. suitable for the cultivation and colonization of all kinds of plants. great choice for soilless planting.%0