Brand Marketing (From Blick.com)
"These brushes are made of pure, fine blue squirrel hair for maximum color capacity.
The hairs of the round brush are blended with select A-grade goat hair to produce a brush that offers a new level of performance and value. The combination allows for more spring than pure squirrel. It still has a great range of flexibility, but returns to its point more readily. Natural, Set of 5 - This set includes sizes 1 and 6 Natural Round, ½" Jumbo Round Wash, ¾" Oval Wash, and ¾" One-Stroke Wash." -Blick