Rapid Rooter package with 50 plugs by General Hydroponics. Rapid Rooter is a unique starter plug derived from tree bark. Naturally occurring microbes colonize the root zone and a good air to water ratio makes for rapid root growth.This is the same product as PO120 other than the plastic tray that holds the plugs. As long as you have some type of way to hold the plugs in place so they can drain properly, this is the product for you. Otherwise, consider purchasing PO120 which includes the tray.