This was one of several display samples that I created. I love stringwork, so I made it to show how even very simple stringwork can really dress up a little cake.

It depends on *when* it is breaking... If it is breaking while you are piping it, the problem is with your icing. You may need to change recipes or adjust your consistency. If it is breaking after it is on the cake, the problem is likely that your icing dries/crusts, and then when you pick up the cake, the board (and the cake) flexes and breaks the strings. To fix this, use a solid base for your cake, like the foil covered bases sold at cake supply shops, or make your own from several cardboards stacked together (for smaller cakes) or cut pieces of plywood (for large cakes).