A mixture of sable and synthetic mixed together to perhaps offer the best of both worlds. Sable holds the liquid/pigment and the synthetic offers the spring and durability, whilst maintaining a favorable price. A good all rounder for Watercolors, Oils and Acrylics.
The larger rounds are brilliant for laying on color whilst the smaller rounds are ideal for finer detail.
A favourite for all mediums as a general purpose good all-rounder brush.