Plant Watering Bulbs: The water bulbs are plastic and flexible material and hold a good amount of water(80 ml). It is not easy to break, and have high transparency, you can clearly see the remaining water in the watering bulbs. You are to top up the water every 4-5 days. The Constant Water Source for Plants: Plant Watering Bulbs will automatically water your plants. Just fill water in the watering plant bulb and then poke it in the soil; the water will be slowly emitted and automatically water your plants without the need to set. Very Simple but Effective: The hole diameter is 0.39 inches (1cm); when using these watering bulbs, first press the hole with your thumb, and then slowly put it into the soil until it touches the ground and then loosens it. Package Content: You will receive 12 pcs automatic watering device in 1.96 inch x 5.12 inch/(5cm x 13cm), transparent bulbs and they don't look out of place in the plant pots because of their excellent clear and precise colouring. Capacity of 80 ml per aqua care. You can use it on different plants simultaneously so that you can relax in some time. They are delivered fast and are packed well to avoid any breakages. We hope you are pleased with the quality and the look of these. Wide Application: This Watering Globe does not take up space, Fit for houseplants, hanging plants, potted plants, patio plants and outdoor plants, etc. Different plants need different amounts of water supply, and can adjust the angle according to the water demand of plants.