I use [wgEiffelTowerVaseLink]20" Eiffel Tower vases[/wgEiffelTowerVaseLink] for all of my ostrich feather centerpieces. However, both the shorter 16" vases and the taller 24" vases will work.  Generally, if you are using a shorter vase, you will want to go with shorter feathers. If you are using a taller vase, the longer ostrich feathers will look best.