HIGHEST-QUALITY FIBERS: Exclusive synthetic antimicrobial fibers to protect skin Engineered to better hold, apply + blend product FERRULES WITH UNMATCHED STRENGTH: Durable, corrosion-resistant SigmaAlloy™ Precious metal plating for shine + strength Exclusive, patented interlocking technology Double-threaded engineering SLEEK, DURABLE HANDLES: Solid, polymer-based handles are waterproof + unbreakable Outlasts all product formulas + frequent brush care Double-threaded, interlocking cosmetic brush ferrule