All harness systems are constructed using drop-forged steel hardware for ultimate strength and reduced weight. All hardware is cadmium plated for added protection. We sell 3" premium polyester webbing and all belts are box-x pattern sewn to ensure uniform stitch length and strength. Belts and hardware are routinely tested to verify compliance with SFI 16.1 standards. If you have any question regarding these safety parts for your 991 (2012-2015) Porsche feel free to give us a call. Get your vehicle new safety parts today!