New in the box, never used. Pair of MDC Intelligent Stirrups. The MDC Intelligent Stirrups are a revolutionary new stirrup design that positions your stirrups where YOU want them. Select any of three preset stirrup positions: traditional, 45 degrees or 90 degrees to make your ride comfortable and safe. Relieves pressure on knees and hips. The open stirrup angles greatly reduces the danger of being hung up.