RooTrimmer Air Pruning Containers, 25 Gallon Air Pruning Planters, 100 Liter 20" X 20" D/H Special Packing Interlocked Large Air Root Pruning Planters for Big Tree Grow Outdoor, Black, 5 Packs

25 Gallon Air Pruning Containers: Each set includes three sheets, one round base, and twelve screws. There are five sets in total. Sturdy Pots: It's made of very thick wall, Size 20""x20"", 25 gallon plus, hold big volume soil firmly, good for middle size tree nursery and growing for 2-4 years. Easy to Install: Air pruning containers are very easy to install, just use the plastic screws we provided to joint sheets together, and joint sheets with base, it takes only 5 minuts to install. Great for Transplant: If you want to move the tree after some time, you just taking offer the wall by unscrew the screws, the whole soil ball keep the roots very well. Why It Is Roots Ball: Please search and find more information on internet to get the air pruning function of this container, how special to make the roots goes better