Hog Bristle - is more coarse and stronger than normal synthetic filaments. It is not for smooth pointed brushstrokes like synthetic brushes. Short Handle - Brown + Black Tip 140mm or 6-7inches appx Use- Oil and Acrylic for Art - Good for heavier bodies paints - Strong construction with no loose heads - Great selection of bristle brushes - Non rust nickel plated ferrules Quality built with nickel plated ferrules and solid crimp. White Bristle Brushes are superbly hand crafted from good quality Hog Bristle. Excellent for traditional and water mixable oils, they can be used with acrylics, caseins, and alkyds. These brushes are natural hog bristle NOT synthetic and will perform like a natural hog bristle brush more coarse bristle. Interlocking refers to the abundance of natural flags, or splits, on the tips of the bristles.