This brush is fabulous for detail work...it's great in creases, nice for spot blending, and if you wanted a nice bold line of eyeliner this would be a fantastic brush to use.  Its made from synthetic bristles, with an eco-friendly bamboo handle.

Overall the brush measures 6-1/4" (160 mm).  The slanted bristles are  1/2"(6mm) long at the longest point, and just over 1/4" (4mm) wide.