We provide tennis net posts from the top producers of tennis accessories, including Edwards, Putterman, Douglas, HarTru, and Gamma. Manufacturers provide a one-year warranty on all tennis net posts. Although there are numerous options for net posts, there are only two different "styles" available: external wind net posts and internal wind net posts. The crank mechanism is what the terms "external" and "internal" refer to. The crank mechanism is mounted to the exterior of the net post on external wind net posts, making the entire mechanism "external." The crank mechanism for "internal" wind net posts is located inside the net post.