Turn your regular Greenes Fence Composting Bin into a complete composting system with our Add-On Composting Kit. After the materials in your original composting bin begin to break down, move them to an attached Add-On bin and start fresh with new materials in the first bin. A system of one Greenes Composting Bin and two Add-On Kits will keep your composting process moving seamlessly. Composed of 2 posts, 18 boards, and 30 spacers, this kit assembles with only a rubber mallet. Use a tarp or plywood (not included) to cover bins if desired. Note: Add-On Kits are not for freestanding use and must be attached to a similar sized Greenes Fence Cedar Composter.