The One Stroke Kolinsky Brush #4 is the ultimate tool for achieving precise and detailed nail art. The high-quality kolinsky hair bristles are soft and flexible, allowing for easy and smooth application . The pointed tip of the brush is perfect for fine lines and intricate designs, while the full belly of the brush makes it easy to create a smooth, even finish. The brush is also easy to clean and maintain, ensuring that it will have a long lifespan.