Deep Root 12" Linear Tree Root Guides $4.25, 40/$162.00 Deep Root 18" Universal Tree Root Barriers $6.50 Deep Root 24" Universal Tree Root Barrier $8.25 Deep Root 36" Universal Tree Root Barrier $14.25 Deep Root 48" Universal Tree Root Barrier $19.25 Need more information? Please feel free to contact us at 1-800-592-6940 - Ask for Extension 547 or Internet Sales.