Interboro is by far my favorite bristle brush, mainly because it holds up beautifully with the heavy bodied acrylic paint I use -- but also because it comes in SO many sizes and shapes that I can always find what I need.
Since it created with fine pure white Chungking bristle, which is double boiled to ensure it's shape after continued with heavy paint, this brush holds up under the hardest wear. The tuft is designed with our proprietary Interlocked technology to utilize the natural curve of the bristle, maintaining the length of the natural hairs. This brush is excellent for oils, heavy body acrylics, and encaustics. It also comes in larger sizes -- good for mural work.
For more brush information, check out the Dynasty Brush website.