These Shrubtubs Cylindrical CorTen are made of 4mm-gauge CorTen steel. Just like the Shrubtubs Square, they are equipped with a wide, clean-lined edge that gives extra reinforcement and is appealing to the eye. Streetlife recommends equipping these tree planters with the Treetec® Bottum Up tree care system. The CorTen tree planters have a clean design and are also available in RAL-coating. These Shrubtubs can be easily moved and have internal anchor points for the tree root ball.