Grumbacher Palette Knife Set. Grumbacher palette knives are made of hard-wearing ABS plastic that won't corrode or rust. Each tool is lightweight and easy to handle solvent safe and easy to clean and has a large easy-to-hold handle. Use these knives for mixing impasto techniques and multi-media needs. This package contains six tools (Trowel Large Painting Knife Small Painting Knife Painting Spatula Large Palette Knife Small Palette Knife). Each tool measures approximately 10 inches long. Imported.