【Dual Size Set】Includes 16 small + 16 large waterers, total 32 pieces. Fits pots of different sizes to meet the watering needs of multiple potted items, covering various gardening scenarios like homes and balconies 【Automatic Plant Waterer】Acts as a "plant nanny", these self watering spikes deliver water directly to the roots via a cotton wick. Ensures continuous water supply during vacations or business trips, so you return to vibrant, healthy greenery 【Stable Water Control】The wick system releases water slowly, allowing adjustment based on needs. Prevents overwatering or underwatering, keeping soil at the right level for steady growth 【Premium PP Construction】Made of PP plastic with an extended spike for easy insertion into soil. Stays securely in place without tipping, suitable for indoor/outdoor potted items and patio gardens 【Universal Compatibility】Self watering stake works with most standard plastic beverage bottles. Turns empty bottles into automatic watering containers, creating a low cost, efficient self irrigation system