Please note, this item ships from an international seller. Expected delivery is 10-15 days. Instructions: Preparing and planting in rock cubes. Soak in water for 2 minutes. Take out from the water and place for about 15minutes. Put seeds into the hole of cubes. Spray water after seeds inserted. Place it in a seeds tray. product features: Material: Rock wool Size: single 3X3X4CM Packing: 50PCS Notes: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3cm measuring deviation due to manual measurement. 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