Features: Efficient Plant Growth: These 30pcs seed starter sponges promote healthy root development and accelerate seedling growth for hydroponic flowers and gardening plants. Boosts Seedling Growth: The seedling growth sponges act as a growth helper providing the ideal environment for seedlings to grow resulting in stronger and healthier plants. Superior Water and Air Permeability: With good air and water permeability these growth plugs ensure optimal moisture and oxygen levels for robust plant growth. Versatile Application: Suitable for hydroponic flowers gardening plants and any other seedling these seed starter plugs are a versatile tool for promoting the growth of various plants. Promotes Healthy Growth: These growth plugs are a reliable tool for promoting plants' overall growth ensuring they develop into vibrant and thriving specimens whether in soil or hydroponics. Specifications: Material: Coal putty Size: TN1103: 3*4cm TN0415: 3*5.5cm TN0719: 3.2*4.6cm TN0620: 2.1*3.6cm TN0524: 2.3*6.5cm TN0927: 4*5.2cm includes: 30 *Seed Starter Sponges