This is a set of 4 decorating couplers by Wilton, designed for all occasions. The couplers are made of solid white plastic and are brand new and sealed. They have a 2-inch diameter, length, and height, with a width of 2 inches as well. The couplers are specifically designed for use with nozzles and are manufactured in China under the WILTON brand. They come as a custom bundle and are suitable for various baking and cake decorating needs.