Three colors12 pieces (4 pieces each in blue, green and orange) so you have tons of options. Easy to use: Plant self-watering spikes without the hassle of installation, all you need to do is cut a hole in the bottom of the bottleTighten the drip irrigation devices, then drive them into the ground with no need for a nail and no risk. (Note: the use of large bottles should be corrected, a wooden stick can be fixed.) Planting without worry Plant watering devices, automatic plant watering devices are good tools for gardening. You don't have to worry about plants every day. Plant watering devices are perfect for scientific planting when you're on vacation or busy. Plant watering devices can help you take care of plants and make them healthier. Widely used Self watering plant system is very suitable for potted plants, plants indoor plants, shrubs, patio plants, hanging baskets, hedge pots, hanging plants, outdoor gardens, small trees, etc. DesignConstant pressure design, the water flow is more stable, and the sealed port opening dustproof design can prevent dust and insects from falling and causing clogging. The 28mm bottle mouth has a universal design that fits most bottles.