Check the listing for details. VIVOSUN 1.6" 112 Plugs Rockwool Cubes Hydroponics Grow Stonewool Starter Cubes. Condition: New. Listed at 14.39 USD. About this item Rockwool Cubes Material: This rockwool is crafted from natural ingredients, including 60% basalt, 20% coke, 20% limestone, and a trace of iron slag; They are melted at high temperatures and spun into fine fibers, then compressed into blocks by a unique process, which makes them durable. Excellent Permeability: This rockwool has a high porosity of 95%, which enables plant roots to access plenty of oxygen for rapid growth; It also fosters the formation of strong and healthy root systems, creating an ideal environment for root development Sterile & Water-Retaining: This rockwool is inorganic and sterile; It won’t harbor any harmful fungi that could harm your plants; It also holds water for a long time, ensuring your plants get enough hydration and nutrients Easy to Use & Observe: These light and fluffy rockwool cubes are easy to cut to any size; Each cube has a hole for your seeds or cuttings, and you can transfer the cubes to any medium when the roots develop; It is also easier to observe the growth on one sheet Multiple Applications: This pack contains 4 sheets of rockwool, with 112 cubes each; They are ideal for hydroponics, plant propagation, cloning, cuttings and more; These rockwool plugs are much easier to use than soil and suit all growers