【Cute Cactus Shape & Safe Glass Material】These glass waterers feature a cute cactus shape, available in natural green or colorful designs. Crafted from safe high borosilicate glass, they come with a narrow neck that allows easy insertion into soil. The transparent design enables you to check the water level effortlessly, blending stylish appearance with practical functionality. 【Easy - to - Refill Design】Equipped with a round hole at the top and a rubber stopper, these self - watering bulbs are simple to refill. Just dig a small hole in the soil using a fine tool, insert the bulb, and then fill it with water. This design helps maintain optimal humidity levels in the soil, ensuring your plants stay properly hydrated and healthy. 【Adjustable Water Flow & Long - lasting Hydration】These bulbs can keep plants hydrated for 3 to 7 days, and in some conditions, even up to 2 to 3 weeks. If you notice water flowing out too quickly, you can wrap a thin damp paper towel, cotton, or cloth around the spout to regulate the flow. This function meets the needs of different plants and soil types, providing effective watering results. 【Secure Packaging & Ideal Present】Each set contains 4 self - watering bulbs, which are securely wrapped in foam and packed in a sturdy cardboard box. This ensures the product reaches you in good condition. With their practicality, these glass watering bulbs make an ideal present for any plant lover. 【Suitable for Busy Users & Promotes Plant Growth】These self - watering bulbs are perfect for busy plant owners or those seeking a more relaxing gardening experience. They ensure plants receive consistent water supply, effectively promoting lush and vibrant growth of your plants.