Catalyst Silicone Wedge Tool. This tool is not quite a brush or a palette knife. It is crafted of flexible silicone to allow artists a new form of expression. It is designed for use with heavy body paints, oils, acrylics, and water-mixable oils. Can also be used with clay, plaster or even food crafting. It is made of FDA approved silicone. This package contains one 4-3/4x3 inch wedge tool. Available in a variety of colors and shapes, each sold separately.