Set of 20 Heavy Duty Slotted Hydroponic Net Cups Material: FOOD GRADE SAFE plastic for consumable plants. Thickened PVC material that can withstand the pressure. HEAVY DUTY durable design can withstand years of frequent use. SLOTTED DESIGN: Net pots with holes in the bottom of these cups produce healthy roots with even drainage, which let the roots grow their own way, right down through the pot and out of the sides,allow for bigger, healthier roots. HEAVY DUTY WIDE RIM: makes pots easy to grab, pick up and a breeze to transport. Quickly lift to inspect roots, growth and plant health. Featuring raised bottoms for self-standing applications, cups will stand alone without balancing them. Net cups suit for hydroponics or soil base. Easy to clean and corrosion resistant.