This product is a replacement for the factory elastic straps that seem to wear out after 2 years.  The straps are located between two of the top support bars and help the top to fold properly.  When the straps lose their "stretch" the convertible top will not lower all the way down because the support bars are not pulled into position as the top folds.  Many owners don't know they have the problem.  In fact, I've heard of Honda dealers that are unaware of the problem and don't know that the top should fold down below the level of the trunk.

Instructions included in package but you can download a PDF file here.