Da Vinci's Maestro designation is reserved for brushes manufactured using male winter Siberian Kolinsky Red Sable fur. These are top-of-the-line brushes. The extra sharp needle-like point and longer tapered hair length result in faster action at the tip. - Da Vinci Maestro Kolinsky Sable Brush - Round, Short Handle, Size 3KOLINSKY RND SZ 3 -