Blush Blocking Brush Set. Includes: F43 Soft Angled Cheek Brush. F11 Soft Sculpt Brush. Features: TECHNOLOGY. HIGHEST-QUALITY FIBERS:. Exclusive synthetic antimicrobial fibers. Engineered to better hold, apply + blend products. 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. Outlasts all product formulas + frequent brush care. US Patent No. D862,901. EU Registered Design 005782018-0001. (Chinese Patent for Design). ZL 201830331890.3. Additional Patents Pending. :