Features: Scientific Watering: These self watering spikes, as auto watering inserts, can effectively and slowly drain water into the plantings, promoting root health and avoiding overwatering or underwatering, keeping your pot greens perfectly moist. Easy to Use: Fill the top of the watering can and insert it into the soil. The self watering spike gradually releases water into the soil. These self watering spikes can independently provide watering for up to 4 days, ensuring that your plantings stay healthy even if you forget to water them. Size: 13.2×9cm/5.20×3.54in. Material: Terracotta