The Root Spa Bucket System is a set of 4 black 5-gallon buckets designed for hydroponic use. With a capacity of 5 gallons each, these buckets are perfect for growing plants in a hydroponic system. The added handle on one bucket makes it easy to transport and move around as needed. The Root Spa brand ensures quality and reliability for your hydroponic gardening needs. Includes 4-5 gallon buckets, 4 mesh basket lids, 1 air pump with 4 outlets, grommets, tubing, elbow connector and clip hardware.