JD Eee Z 4.5 Row 8 foot professional harrow is ideally suited for just about any riding style.
With four & one-half rows of s-tynes, ideal rotation of the footing is achieved as the footing material has room to flow through the s-tynes, yet the offset s-tyne pattern of spacing delivers an excellent undercut. This harrow is ideally suited for sand arenas with a required cutting depth of 1" or less.
The JD Eee Z - 4.5 Row shines in Dressage, Jumping, Flat Work and Reining arenas. 
* This harrow is favored by John Dienhart for Dressage arenas, as seen at Rancho Murieta Equine Complex, CA
(Brushes are not available.  Signs for professional arena facilities only).