PRINCETON ART & BRUSH-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 12cm x 7.6cm wedge tool. Available in a variety of colours each sold separately. Imported.