Princeton Artist Brush Catalyst Silicone Blades, for Artist Painting, Encaustics, Ceramics, and Food Crafting, Blade No. 2, Size 30 - Catalyst tools are crafted from flexible silicone to allow artists a new form of expression. - Catalyst Blades are mounted on artist brush handles offering a blend of tradition and innovation. - Designed for use with heavy-bodied paints, Catalyst is at home with oils, acrylics, and water-miscible oils. - Because they are heat-resistant, they excel with encaustics. Artists are using them with plaster, clay, and even frosting. - Made of FDA-approved silicone, Catalyst Blades are great for food crafting.