Watch Wilton Video " How to Decorate Cupcakes with Tip #402: 
https://youtu.be/GCkoe-CCKyI?si=hzSjmZJC0x-1Az5_
 
Creates plain, fluted, shell-borders and special effects, Tip works with standard bags and fits large coupler. Decorate your cakes, cupcakes, cookies, and pies with the #402  ruffle piping tip. Made of durable stainless steel, this tube is rust-resistant and designed to withstand repeated use without bending out of shape.