Everything you love in the single 5G kit times 4 Highest quality buckets using extra thick 90 mil buckets thst arealso FDA approved for food safety., water level inficators cut to stand tsller then buckets, gromnets already installed. Need we say more? .......ok also includes: 6L expanded claypebbles 8x starter rockwool cubes 25 feet of versatile hydro Gecko green 1/4” food grade silicone airline 4x 6” wide lip mesh net bucket lids with dual port quick connects and 4x airstones Ecoplus4 outlet adjustable Air pump DWC 101 startup booklet Growing support from Versatile Hydroponics . And moneyback quality gaurantee