Features: *Made from molten rock spun into cotton candy-like fibers and then compressed into cubes. *Sterile after high-temperature treatment. *Low bulk density, light texture, and high porosity. *Good air permeability, strong water absorption, and good drainage. *Suitable for growing and colonizing all kinds of plants. *Instructions: Prepare and plant in rock cubes. Soak in water for 2 minutes. Remove from water and let sit for about 15 minutes. Place in the hole of the cubes. Spray with water after insertion. Place in a tray. Specifications: *Color: Green *Size: Approximately 25 x 25 x 40 mm, Package includes: 50/100 cubes. Note: 1. The actual color of the item may be slightly different from the pictures shown on the website due to many factors such as monitor brightness and light brightness. 2. Please allow for slight manual measurement deviation in the data.