Princeton Artist Brush Catalyst Nylon Contours, for Cake Decorating, Food Crafting, Ceramics, Plaster, and Heavy Acrylic Media, Contour No. 63 Mint Contours are made out of a stiff nylon Fun shapes and convenient sizes Heat-resistant, solvent-resistant, and dishwasher safe Great for food crafting, ceramics, plaster, and heavy acrylic mediums Dishwasher safe