CRIMPERS

Crimpers are a type of kitchen tool used for creating decorative edges on pastry dough or edges of fondant cakes. They typically consist of two metal or plastic plates with a serrated edge that can be pressed together to seal the edges of the dough or create a decorative pattern. Crimpers can come in a variety of shapes and sizes, including straight, fluted, or scalloped edges. They are often used for making pies, tarts, or other baked goods that require a sealed edge.

Crimping technique is used on fondant with crimper tools which have patterned edges.
They are used to imprint puffed up patterns on cakes and cookies too.