HS Bow Balance Stirrups Original System 4 from HERM SPRENGER (Germany). In addition to the bow-shaped stirrup supports, the "System 4," which flexes in four directions to match the angle of the shoe, keeps the tread constantly fitting the sole of the shoe. It is easy to maintain a constant stirrup pressure, enabling stable riding. It also mitigates the impact on cartilage and ligaments even during intense movements such as in competitions. The tread is wide, and the use of rubber with different hardnesses in the blue and black parts provides a better grip. Furthermore, System 4 has a function to easily release the shoe in an emergency, making it a safe stirrup. A set for the left and right legs is included. Please use them according to the left and right marks. Size: 12cm There are scratches and dirt from use, but the rubber parts are still soft, and there is little wear on the grip. I washed them with soap, but there are some parts that I couldn't remove completely, so please understand. Please purchase with the understanding that these are used items.