SparkleLife Watering Spikes, 4-Pack/ 8-Pack for Small or Big Plant, Self Watering Planters, for Vacation Self Watering Spike: This SparkleLife economical garden watering spike ensures your plants receive appropriated amount of water; When the soil is wet enough, the SparkleLife spike will stop watering; No need to worry about lack of water and overwatering. Enjoy your Vacations: An excellent choice for automatic watering while on vacations; Enjoy your holiday without having to worry about your plants. Fits Most Plastic Bottles: Perfect for any medium or small size bottles; Fill the plastic bottle with water or combine water and plant food in the bottle then use SparkleLife watering spike to deliver the nourishing fluid for the plants. Set of 4 Spikes: 2 x small sizes (3.3 inch long, green color), 2 x big sizes (5.3 inch long, blue color ) and 2 x nails. Simply Install, 3 Steps: 1. Make two holes in the distance of 1-3cm for water outlet and air outlet; 2. Fill the bottle with water and screw the spike onto the bottle; 3. Insert SparkleLife watering spike into the soil and make sure the two holes are buried by the soil.