Cake Sharpies Flexible Smoothers are a two-piece food-grade plastic set for sharper fondant edges. One piece has four evenly rounded corners; the other has a more curved edge on one end. About 105mm x 78mm. Key Details Pack: 2 flexible cake sharpies Size: Approximately 105mm x 78mm Material: Food-grade flexible plastic Brand: KWare Best For Sharp edges on fondant-covered cakes Round cakes using the curved edge on top Square cakes using two straight edges Frequently Asked Questions How do I get a sharp edge on a round cake? Place the curved edge on the top of the fondant at the rim and a straight edge against the side. Work slowly around the cake until the join tightens. Do these replace a fondant smoother? They complement a smoother. Use a smoother for large surfaces, then the sharpies to refine the top edge. See fondant smoothers, fondant, decorating tools and cake decorating supplies.