Misula Baking ColorSwirl Tri-Color Coupler Decorating Tool Cake Tools Bakeware Cupcake Fondant Cookie Cutters Cream Decorating Bags Converter (2) Material:PVC . Made of food grade material Suit for round bottom piping tips diameter about 1 inch Not suits big size russian icing nozzles ) Easy to keep clean and use The ColorSwirl tri-Color Coupler Decorating Kit has everything you need to get started. Use the ColorSwirl 3-Color Coupler to seamlessly blend 2-3 color icings as you pipe. Choose from double swirl or triple swirl colors. The interlocking coupler pieces connect multiple decorating bags, allowing you to swirl 2 or 3 colors together with one simple piping motion.