Grodan® Stonewool A-OK Starter Plugs ™ in Prefilled trayThe Grodan tray comes prefilled with Grodan A-OK Starter Plugs™ for fast and easy propagation from seeds or cuttings prior to transplanting to Grodan Gro-Blocks. The tray fits perfectly in all standard propagation dome kits. These trays are designed with a unique and convenient thumb slot to make tray removal easy and comfortable.