Sonia Kashuk Core Tools Large Duo Fibre Multipurpose Brush - No 115 Brand new, sealed in the package. This listing includes 2 duplicate brushes. Achieve lush, smooth coverage and a beautiful application with the Sonia Kashuk Core Tools Large Duo Fibre Multipurpose Brush - No 115. This necessary cosmetic tool will quickly become your go-to, with a broad head populated with velvety soft bristles. Ideal for applying powder foundation, blush, highlighter and more.