Tennis Supplies and Equipment offer tennis net posts from the leading tennis equipment manufacturers, such as Edwards, Putterman, Douglas, HarTru, and Gamma. All tennis net posts are backed by manufacturers' one-year warranties. Only two "styles" of net posts are available: external wind net posts and interior wind net posts. There are many different types of net posts available. The crank mechanism is referred to as "external" or "internal." The crank mechanism on external wind net posts is attached to the outside of the net post, and the entire mechanism is "external." The crank mechanism on "internal" wind net posts is located within the net post.