This is a plastic cake fondant smoother or polisher. 

It is used for shaping and smoothing the surface of cakes, especially when applying fondant, marzipan, or icing. 

It helps remove air bubbles, wrinkles, and imperfections to achieve a professional, flawless finish. 

The tool has a comfortable grip for controlled smoothing. 

It can create perfectly smooth edges and straight sides for cakes.