Our UV rated 42" Boxwood wall trellis for indoor or outdoor use, feature our signature Boxwood foliage made from upgraded UV polymer. The trellis can be used to create green walls to cover fencing, wood, or concrete and stucco etc. (Professional contractor recommended for installation over concrete and stucco.) Backing frame is built of PVC slats, 1.5" wide x .75" thick. The backing grid can be trimmed to fit desired space. Sold as a 42" square trellis. This UV boxwood has the industry's only 5 year limited warranty!