SAKURA Koi Brush Marker Set - Colour Set - Pack 6KOI Watercolour brushes are a high quality, watercolour brush marker based on dye that you can blend with either a waterbrush, paint brush or the KOI Colourless Blender. The large, flexible brush tip can produce fine, medium or bold brush strokes, depending on how much pressure you apply. The durable tip springs back to shape as you release the pressure. Brush tip is suitable for hand lettering as you apply more pressure on the downstroke and lift on