【High Compatibility】After soaking, the size of grow sponges are 2.56(height) x 0.9(diameter) inches, will compatible with hydroponics growing systems of most brands. You can use seed starter pods with grow baskets or seed starter systems for reliable germination and healthy root development. Our hydroponic pods also can be used with seedling trays and potted plants, planted in indoor gardens or outdoor soil 【Premium growing medium】Hydroponic sponges are made of 100% biochar cotton with higher fertility, which is beneficial to plant growth. Compared with traditional seedling soil, our seed sponges have balanced pH, strong water wicking and moisture ability, which provide seeds with the perfect balance of oxygen and water for reliable seed germination and seed rooting. And provide soil-free, no-mess, indoor growing all year round 【Professional Design for Growth】There is a small hole at the top of seed pods to ensure that seeds you put in will not fall into the water. The hydroponic grow sponges are surrounded by small grooves to facilitate water circulation and maintain a certain level of humidity, providing sufficient moisture for seed germination. The growth sponges are easy to use, just remove the old sponge and put the new sponge in place. Please soak the sponges for 10-15 minutes before use 【Wide Application】Using the root growth sponges, regardless of geographical and seasonal restrictions, you can grow various types of plants in the hydroponic indoor garden, such as strawberries, tomatoes, basil, mints, herbs, flowers, lettuce, etc. This seed pod kit will be a great gardening gift for your families or friends who like to grow plants, which can provide an easy way for them to grow vegetables, small plants, flowers, etc 【Great Value Kit】You will get 30pcs replacement grow sponges, 10pcs plant labels and 1 tweezers. Enough quantity allow you to start many seeds at the same time, which greatly saves your time! All the Hydroponic sponges are dry and easily stored. You don't have to worry about it affecting the germination and growth of plants due to quality problems!