Specification! Material: High-Quality PP Plastic.Colour: Blue and Green Package Include: 12* Self-watering spikes (6*blue, 6*green) - 12* Valve switchSize: 12.7x 2.54 cm or 5x1 inches.Easy to use: The plant watering spikes are made of good quality plastic and odorless. Without any lengthy installation, you just insert these self watering spikes into any kind of bottle. The spike provides a slow and steady drip of water right to the roots so youll be less likely to drown your plant by overwatering.Adjustable: The water flow rate can be adjusted by adjusting the control valve. The plant watering device can control the dripping speed. You can easily adjust the speed according to your need.The self watering spikes meet your need without making any complications. Spikes comes with specialized absorbent for the bottle so that you physically slow the water movement into the soil for longer watering periods, such as over a weeklong vacation.How to Use:1. Fill the bottle with water.2. Assemble all parts of the product together.3. Insert the assembled dripper into the filled bottle, then hold the water bottle upside down vertically.4. Place the plant waterer into the soil surrounding your plant, and then adjust the dripping speed.Spike With Attached Plastic Bottle: If you have a relatively large pot, you can use a spike with an attached plastic bottle. Commonly requiring a 2-liter size bottle, you screw the bottle onto the spike and fill the bottle with water at its cut end. As the soil dries, water moves slowly downward using gravity as its major force. To water the plant evenly, the spike needs to be completely pressed into the soil. Allowing its entire surface area to contact the soil provides uniform