The summit brush is the next generation of white synthetics - it allows for maximum color holding capacity and is great for watercolor, gouache and fluid acrylics. Summit’s blend of hair is stiffer than a traditional watercolor brush, but not as stiff as Umbria or Catalyst which makes it just right for fluid applications.Details:FilbertSize 4Ultimate white synthetic filamentSturdy ferruleAttractive blue lacquered handleMedium to firm stiffnessFor use with watercolor and acrylic paints