If you have come here, you can testify to the success of your Rapid Rooter Starter Tray and you need another set of 50 replacement plugs in order to start another batch of newborns. Congratulations! Don't be shy about telling your friends about your success. While you're at it, make sure to direct them to Rogue Hydroponics to pick up their very own Rapid Rooter Starter Tray. Happy rooting. Made from naturally composted tree bark, the air-to-water ratio in these plugs promotes root growth.