Feature:Material: PPSize: As the pictures shownRansparent flow control,You can go from big to small, No dangerous trepanning and trouble preparing work, Just put inthe right bottle.Don't worry about controlling less traffic.You can set the corresponding flow according to the time you need, so you don't have to worry about the water being too fast or the hole being blocked.Simply fill a bottle with water, insert Plant-A-Bottle into the soil ,these plant watering spikes will keep your plants alive by delivering just the right amount of water to them preventing water overflow. Grow healthier plants by preventing over or under watering.Product include:12Pcs Automatic watering deviceNote:Under the influence of light and the display, the color difference may decrease slightly.Due to manual measurement, please allow size differences about 0-2cm.