This item is for 6 NEW Catalyst Blades are made from a flexible silicone. The widest three tools are size 30mm and the smaller 3 are size 15mm.  These flexible Catalyst Blades are a more unique tool than a simple palette knife or brush. They are heat-resistant to 450 degrees Fahrenheit, making them perfect for using with encaustics. They are designed for use with heavy-bodied paints, and also excel with oil paints, acrylics, and water-miscible oils. The silicone easily wipes clean, and is solvent resistant, making cleanup a breeze with soap and water. Dried paint can easily be peeled off the silicone surface, and blades can even be separated from their handles for better cleaning, and replaced when dry.