Yves Saint Laurent Round 1pc Eye Blender Brush Shape and Design: A round eye blender brush usually has a circular or slightly domed shape. The bristles are soft and densely packed, allowing for smooth blending and diffusing of eyeshadow. Bristle Type: High-quality brushes often use natural hair or synthetic bristles, depending on the brand and product line. Purpose: Eye blender brushes are designed to soften and blend eyeshadow along the crease and edges, creating a seamless and well-blended eye makeup look. Application: The brush is generally used in a circular or windshield wiper motion to blend eyeshadow and create a gradient effect. Brand-specific Features: Yves Saint Laurent, being a luxury brand, might incorporate unique design elements, materials, or branding into their brushes to distinguish them from others.