Neef proudly introduces its own new development KAZAN synthetic. Not only do they have the softness and suppleness of a natural squirrel but we feel they completely out perform them. More importantly, from our own lab test, a KAZAN brush may actually outperform in water holding capacity by 17% greater than the natural hair version. Also, don't forget what 100% synthetic gives you, the stress-free painting of no loose hairs, durability, easy brush care, and stable quality.