The PME Closed Scallop Serrated Crimper Set CS280 gives the decorator a simple but elegant way to add design and texture to your creation. They are approximately 1/2" & 3/4" wide & 3" long, and have an adjustable 'O' ring so that you can get the same size crimp again and again. The crimpers can be used with a variety of materials, such as Rolled Fondant, Gumpaste, Marzipan, Sugarpaste, Modeling Chocolate, etc. PME Includes instructions for use are on the back of the package. The Stainless Steel crimpers are very durable and will not rust or discolor. These cutters are made in England by PME Sugar Craft.