Bob's Tree Combi Brush for Watercolor & Acrylic Painting Made in Prolene synthetic filament for Bob Erends' Watercolor technique. A demonstration in tree painting Resilient and very hardwearing. Manufactured to Bob's easy to use style Beautifully handcrafted in the UK & Manufactured to the Highest Standards Soft and silky feel with lovely spring allowing great control and wonderful color-holding Sharp working edge allows broad strokes and accurate detail