Sigma Beauty Skincare Brush Set in Beauty: NA. Sigma Beauty Skincare Brush Set in Beauty: NA. Take your self care up a notch with Sigma's Skincare Brush Set. These six specially-designed brushes are crafted using SigmaTech fiber and silicone for gentle application of skincare products. Each unique tool is designed to not absorb your skincare formulas, allowing you to get the most of your favorite products and improve your results.. S01 Clay/Mud Mask - scoop and evenly spread thick masks onto skin; S10 Serum - apply liquid and gel serums gently and evenly; S05 Moisturizer - use angle to gently apply moisturizer. S15 Gel Mask - whip gel masks onto skin in circular motion; S20 Eye Cream - press eye cream into skin without tugging; S02 Spatula - scoop and mix skincare products for custom care. Durable, corrosion-resistant SigmaAlloy ferrule with precious metal plating for shine and protection. Solid, polymer-based handles build to outlast skincare formulas and frequent brush use. FREE 2-year warranty on Sigma brushes and brush care gadgets. For conditions and exclusions please visit SigmaBeauty.com. SGBY-WU11. SBS01.