Features: 1. Made of high-quality molten basalt, forming fine spongy fibrous knots. Provide you with the best way to germinate seeds and cuttings. 2. It is very suitable for air culture and hydroponic culture, because the fiber can keep air, moisture and nutrients well, and at the same time provide the best plant germination. They also do not resist root growth to receive a stronger root system. 3. Designed for faster and better plant reproduction, it takes up the smallest space, and it can be transplanted more easily whether it is in a net pot, block or any type of growth medium. 4. Keep moisture and provide good ventilation to promote healthy root growth. An excellent choice to improve the homogeneity of soilless culture. 5. Rock wool plugs can be used for large quantities of seedlings, and can also be used for family seedlings. The nursery cycle is short, convenient, fast and efficient. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Size: 20*27mm Package List: 50pcs x Seed Starter Plugs