Union Sport Harz MXSL Series Full Carbon Fiber Cycling Saddle | Black or White Available in: Carbon spec 170g, Carbon Composite spec 210g, Polycarbonate spec 230g. Double Pivot System Designed for Comfort While Maintaining an Efficient Power Transfer. Minimal Flexibility for the most Power Transfer & Road Feedback. Impact & Field Tested. Quality Control Passed. Manufacturer Warranty and Crash replacement Available.