Welcome to our store! The self-watering spike is a practical garden watering tool designed to deliver water directly where plants need it most. Each pack contains 4 blue and 4 green self-watering spikes, a total of 8 pieces. The spikes are made of durable plastic, with a product size of approximately 15.8 cm or 6.2 inches in length. The top outer diameter is approximately 2.1 cm or 0.8 inches, making them compatible with most cola packs, mineral water bottles, and beverage bottles. The weight of each spike is approximately 110 g or 3.9 ounces. These spikes are easy to use: simply screw the head into a full water bottle and insert the tip into the soil near the stem of a potted plant. They also allow you to mix water and plant nutrients in a bottle, using the drip irrigation to deliver nutrients. Suitable for a wide range of applications including vegetables, potted plants, indoor plants, patio plants, desktop pots, outdoor gardens, indoor plants, aquatic plants, garden plants, herbs, hanging baskets, hanging flowers, small trees, and shrubs. Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We do our best to provide you with satisfactory after-sales service.