The Herm Sprenger System 4 Stirrups are rated one of the safest and most comfortable stirrups by The Horse Journal. The System 4 Stirrups allow movement in four directions at the same time. This is the only stirrup in the world that has dual lateral flexibility thereby softening the impact on ligaments and cartilage. Ideal for riders with joint and knee problems. In the event of a fall, this stirrup is much less likely to trap your foot. Made in Germany. Great used condition. Upgraded metal tread will not wear out like rubber.