If you plan to decorate cakes often, a turntable is a must. It makes for easy application of frosting, as well as countless piping techniques. This is a basic, inexpensive turntable--I have accumulated at least 2 or 3 of these and I find that they get the job done. I actually have a "fancier" metal turntable also, but I use this inexpensive one most since it is nice and low and easy to work with.
Amazon Description: Turntable turns smoothly clockwise or counterclockwise on hidden ball-bearing track--- Great for left- and right-handed decorators--- makes the decorating process easy--- Non-slip surface on top of the platform keeps cake or cake board in place while you decorate--- Soft-grip material on base of stand secures turntable on countertop or table--- Measures 11.9 inches x 11.9 inches x 1.2 inches