FIGS. 7A and 7B illustrate top plan views of an interlocking segment 260 and an engagement segment 270, respectively. As can be seen in FIG. 7A, the interlocking segment 260 includes a main body 261 and an edge 262 of the main body 261 defines external or edge slots 263 that can interlock with external/edge slots 263 included on another interlocking segment 260 from another strip. In the depicted embodiment, the main body 261 is a substantially planar, rectangular body and the slots 263 include three slots. The three slots 263 allow the depicted strip to interlock with three other strips (with each slot receiving one additional strip). However, in other embodiments, the interlocking segment 260 may include any number of slots, or any other features, so that the strip 252 can be interlocked with any number of strips. By comparison, the engagement segment 270 does not include edge/exterior slots and, instead, defines interior features that can secure the strip 252 to an engagement end 28 of a post 26. In particular, the engagement segment 270 defines a central opening 272 so that the engagement segment 270 is substantially annular. In some embodiments, the central opening 272 may secure the strip 252 to a post 26 on its own; however, in the depicted embodiment, the central opening 272 also includes/defines notches 274 that can engage slotted flanges 29 included on the engagement end 28 of posts 26 (see FIG. 6).