Grodan Multiblocks 1"x1"x1.5" Case of 6000. Sheets of 200. Grodan A-Ok Starter Plugs are the caring home your seeds and cuttings need to get started. These A-OK plugs are designed for use before plugging into larger Gro-Blocks. Ensure your seedlings get started on the right track with Grodan A-Ok. 1 inch x 1 inch Plugs.