Sigma Beauty's Serum Brush is a multipurpose skin care tool designed to evenly apply liquid and gel serums onto your skin. The layers of soft, flexible fibers vary in length, allowing for a gentle and beautiful application every time. Key Benefits:Great for smoothing oils across the face and working them into the skinSynthetic, antimicrobial bristles in various lengthsWaterproof handles | Sigma Serum Brush | Dermstore