You will get 4pcs in this package. Applicable to bottles with a diameter of 28 to 30mm, product size: 18 * 6cm NEWLY UPGRADED ONE-PIECE SELF WATERING SPIKES: This upgraded self watering spikes have a special bevelled and dual runner spout with a control valve that adjust the dripping speed of 40-60s/drip, and the sustained release drip lasts for 3-20 days. These plant watering stakes are designed to provide great convenience for business travelers, vacations, or busy gardeners. No need to worry about your plants during travel, business trips and vacations. ENERGIZE YOUR PLANTS: This auto watering spikes keep your plants healthy by providing the perfect amount of water and will help your plants grow better, no more over watering or under watering; automatically provide the right amount of water for each plant; your plants will not only survive, but thrive. HIGH COMPATIBILITY: The automatic plant waterer works with 90% of the bottle tops on the market, marketed in 28-30 mm (1.1") internal diameter, you can choose from Coca-Cola, Pepsi or soda bottles (measure the internal diameter of the bottle top before installation). REDUCE YOUR GARDENING WORK: This automatic watering device allows your plants to water themselves, so you don't have to spend time watering and you could have more time to enjoy your plants and your life, this works for many plants such as vegetables, potted plants, houseplants, patio plants, flowers, herbs, hanging baskets, desk pots, hanging plants, outdoor gardens, shrubs. EASY TO USE AND STORE: The self watering spikes for outdoor plants with high strength and toughness, good heat and cold resistance, safe and durable. You could use it repeatedly or store it because each irrigation dripper ensures long service life. We offer Guarantee for every customer. You could contact our customer support. We take the greatest pleasure to offer the most satisfactory shopping experience to you.