R+CO ROUND BRUSH #4 Diameter 3"
"I designed this set of brushes for R+Co so that you can achieve the perfect blow dry. I believe that a great blow dry starts with having great brushes. While ceramic, metal and nylon round brushes can damage the hair; our round brushes are made with natural boar bristles, an ergonomic handle to lessen blow dry fatigue and a handcrafted wooden core that will leave the hair smooth and shiny. Your hair is full of secrets." – Garren
#PROTIP: Think of the diameter of the brush as the size of the bevel you'd like to create at the ends of a style.