Tennis Supplies and Equipment offer tennis net posts from the leading tennis equipment manufacturers, such as Edwards, Putterman, Douglas, and Gamma. All tennis court net posts are backed by manufacturers' one-year warranties. There are many choices of net posts, but there are only two "styles" to choose from external wind net posts and internal wind net posts. The "external" or "internal" relates to the crank mechanism. On external wind net posts, the crank mechanism is attached to the outside of the net post and the entire mechanism is "external". On "internal" wind net posts, the crank mechanism is inside the net post.