This set of twelve Catalyst contours by Princeton gives the artist versatility when working with heavy-bodied paints. Their ergonomic shape allows for comfort in your hand and a controlled interaction with your work. Composed of nylon and silicon, each contour features a unique edge that is perfect for playing with textures. Heat-resistant, the contour excels with encaustics and artists have also used them with clay, plaster, ceramics and food crafting. Easy to clean, each tool is solvent-resistant, dishwasher safe and approved food safe by the FDA.