We love making forts, but we hate the sheets being pulled off. So, I invented some plastic clips that keep the sheets in place so they can't fall off or be pulled off. Alex discovered that you can twist them around to tension the sheets and make the entire structure even more rigid! These clips are compatible with the Discovery brand construction fort and the flexible set with the pastel colored round balls, both available on Amazon. We love 'em even more now! In addition to holding the sheets on, these little clips can be used to actually support the structure. Say you have a thin awning or other cantilever structure, you can clip the sheet on with these and use your sheet as a support! This opens up additional possibilities and frees up some sticks and balls that otherwise would be needed for support. The kit comes with a dozen (12) clips, which will allow you to make some pretty awesome tents!