Our 32oz hydroponic mason jar planters are a great way to get started with hydroponics and are the perfect size for growing herbs and greens of all kinds! Each jar is painted black with a viewing window, as too discourage algae growth but also allow you to monitor root growth and water levels. This Hydroponic Salad Greens Growing Kit includes: 1.) Lettuce Seeds of your choice 2.) Net cup 3.) Rockwool cube medium 4.) Collar 5.) Nutrients All you need to do is simply add water, place your kit in a sunny window or under grow lights, and watch your plant grow!