Acrylic & Oil. Fine quality hog bristle, for short brush strokes, and small detailed areas. Long handle. "Neributa" is the name of the techniques to produce top quality hog bristle heads. It means kneaded hog bristles in Japanese which only the finest Chungking hog bristles are used for its production. This method has been developed for more than 40 years by Japanese Artisans who possess superb brush making skills. Cream coloured, not bleached or boiled, naturally flagged, memory shape interlock construction that brings the brush back to the original shape after use.