Tip is 1 inch wide. Princeton Brush Catalyst Mini Blades, 1. Ideal for oils, acrylics and water-miscible oils, this contour tool allows you to achieve stunning color combinations, dynamic textures and flowing patterns. It is approved food-safe by the FDA and works well with plaster, clay, encaustics, ceramics, cake decorating and food crafting. It is solvent resistant for long-lasting, quality use. Clean up in most cases can be done with mild soap and water, and dried paint can be peeled off the silicone surface.