The innovative Riverstone Industries Hydroponic Seed Tray - Set of 2 makes growing plants from scratch a snap. This set includes two trays made of commercial-grade polystyrene with pyramid-shaped cells that virtually eliminate transplant shock. These reusable seed trays float and wick water to the new seedlings as needed. They provide a stronger root system and help promote a 90% transplant success rate. Choice of available configuration.