The Ateco #789 Cake Icer Decorating Tip is made to quickly ice the sides of the cake quickly with it's 1.8" width. This tip is made with two sides for 2 effects It has a flat edge & a serrated edge. These tips are designed for the cake decorator to be able to create beautiful cakes & pastries. This piping tube is made not to be used be with a coupler the Ateco Icing Bag is made for these tips. Piping tips are best cleaned by soaking them in hot soapy water and using a href="http://www.ahcakedesign.com/at1660.html">Tip Brush to thoroughly clean the interior, rinse & air dry.