AtecoDecorating Comb and Icing Smoother
I also like that it has three other sides with different shapes that can be used to create beautiful designs and make your cake stand out from the rest. You can also get this in a three-sided version or a set of the two types.
To achieve the best results, make sure your buttercream-covered cake is chilled in the freezer for about 10 minutes. Then get it out and scrape the excess buttercream to achieve the right smoothness.