Princeton Catalyst Wedges ergonomically designed to fit in hand allowing a direct interaction with work. Catalyst Wedges are available in 6 different shapes. Made of FDA-approved silicone with 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