Princeton Catalyst Contours are ergonomic design of the Contours fit comfortably in hand to make any sculpting, shaping or texturing even easier. They are available in 12 different styles / shapes. Clean-up is a breeze. The nylon is easy to wipe clean and is solvent resistant. Designed to use with heavy-bodied paints, oils, acrylics, and water-miscible oils. Ideal for colour shaping & texturing. Stiffness - 5 on 5. Artists are using them with ceramics, plaster, clay and more as sculpting and modelling tools.