Micro 20 Soil BlockerThese are GENUINE Ladbrooke soil blockers, made in England. More than 4 percent of the worlds oil production goes into creating plastic and an additional 3 percent to manufacture it. Cut back on the plastic used to plant seeds with the Micro 20 Soil Blocker. Reducing nonrenewable plastics, this Micro 20 Soil Blocker makes 20 inch soil blocks simultaneously, perfect for starting small seeds or nesting into the Mini 4. Soil Blockers are easy to use and