Matfer Bourgeat 370100 Set of Three Frames, Silver Set of Three Frames, for easy and simple assembly of desserts, mousses and opera cakes in perfect uniform layers of 2, 3 or even more flavors. Step by Step process to make the perfect Mousse: Place the stainless steel sheet on a flat surface and position the first chosen frame. Includes Stainless Steel sheet plus 3 Aluminum frames.