The Sizzix Clear Plastic 3 1/2" Circle Shaker Domes 4PK #664190 is a set of four plastic domes specifically designed for storing and organizing die-cut pieces in cake pops, cupcake toppers, and other craft projects. The clear plastic material allows for easy viewing of the contents inside, making it convenient for sorting and accessing. Each dome has a 3 1/2" diameter, providing a standard size for various crafting projects.