High quality: Made of ceramic and ABS plastic, this automatic irrigation spike helps water plants in pots and containers both indoors and outdoors. Precise and efficient: When the soil in the pot is dry, the spike gradually releases water. When the soil is sufficiently moist, the water flow stops automatically. You can also add liquid plant food to support plant growth. Easy to use: Simply screw the spike into a plastic bottle filled with water and insert it into the soil. No need to leave a bucket of water nearby. Wide use: Designed for slow drip to minimize evaporation and reduce the risk of root rot. Ideal for business trips, vacations, or for individuals who have difficulty maintaining a regular watering schedule. Product features: This small watering spike helps solve the daily watering problem and ensures plants are watered when unattended during travel. The ceramic-based system automatically controls water release based on the soil's moisture level. Saves time and effort, suitable for indoor and outdoor use, with long-lasting performance and great value. Material: Ceramic (white part) + PP plastic (green part) Product size: Large mouth diameter: 4 cm, small mouth diameter: 3 cm, height: 10.5 cm Quantity: 4 pieces Note: All measurements are manually taken; please allow 1–3 cm variation. Due to differences in lighting and display, some color variation may occur. The actual item may vary slightly in appearance.