Zbrush 4r8 p2 IMM Brush for creating fur or hair. Brushes are UVW unwrapped to allow for alpha masking. This enables poly paint or deformations to be applied.
*Update - Fur Brush Unwrapped older version fix
The fbx contains the subtools for the brushes, as well as pdf instructions on how to make them into an IMM brush. Use this if you haven't updated to the latest version (4r8 p2) as zbrush doesn't allow backwards compatibility.