Helmet Visors Base Plate Lens Holder For FF801 FF323 FF390 FF397 OF521 Helmet Replacement Parts Base HolderFeatures:PC these shield bases are built to withstand the toughest riding conditions and provide protections for your helmet.Replace your worn-out helmet shield base with ease using our replacement spare parts!Easily to install, ready to use, convenient, fast and flexible and practical, standardized can be used for a long lasting.Fit for FF801 FF323 FF390 FF397 OF521 HelmetSpecifications:PC Package Includes:1Pair Helmet Visors BaseNote:Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.