PME Stainless Steel Icing Ruler This Polished Stainless Steel Icing Ruler by PME is a strong icing ruler, perfect for creating a smooth finish to the top of your cake when royal icing. Simple to use - apply icing to top of cake using a paddle action with a palette knife, then use the ruler at an angle to draw across the top of the cake from back to front to create a smooth surface. Also useful for marking straight lines. Please Note: No measurement markings on this ruler. Dimensions:  16\" (L) x 1\" (W)