Some brushes are synthetic and some are natural. Creme brushes MUST be synthetic. Powder brushes, Kabuki are natural. Certified cruelty-free.
The Creme Definer, Concealer, Pointed Eyeliner and Angled Eyeliner are synthetic (which is the best for creme and gel products). The powder brushes are hand cut, natural hairs (which are the absolute best for mineral powder).