Automatic watering devicesself-watering spikes for plants with pressure valveslow release for indoor and outdoor plants Features: 1.ManufacturedMade of durable ABS material that can last for a long time. 2.Precisely control the flow rate and give an appropriate quantity.Suitable water for different plants and flowers. 3.Easy to useuse, save your time and energy on watering plants. 4.These self watering tips fit bottles with 1.1 inch inner diameter capsule, which are easy to remove.find.Specification: Color: blue + green Material: ABS Quantity: 30 pieces Easy to use.use: 1.Insert the control valve into the plant waterer. 2.Poke holes in the bottom of the bottle or cut it. 3.Regulate the flow speed according to your needs. 4.Turn the bottle upside down and insert the watering tips into the soil. Note: Please allow a difference of 1-1.3 cm due to manual measurement and slight color variation for different display setting.Thank you for your understanding, have a nice day!