This 1.5 in. rockwool starter plug is a high-quality inorganic and sterile growing medium, with dimensions of 1.5 in. x 1.5 in. x 1.5 in. It is very suitable for various planting needs such as cutting propagation and seed germination. It can effectively promote rapid initial rooting of the root system, and its texture is solid and guaranteed. It is much easier than starting seedlings in soil. The pre-drilled planting holes make seeding and plant propagation easy and convenient, which can be easily handled by both gardening enthusiasts and commercial growers. It is made of selected natural rocks, with a neutral pH value and sterility. It can still maintain 20% air space in a saturated state, absorb nutrient solution while retaining sufficient oxygen, and help the root system grow rapidly. Whether used in home hydroponic setups or large-scale commercial growing operations, it delivers consistent performance. Its durable structure ensures long-term use without easy breakdown, providing reliable support for plant growth stages.