All Bell Helmets for car racing are compatible with Frontal Head Restraint systems as per latest FIA standard. They are all fitted with M6 terminals and come with a destruct-on-removal label with unique serial number situated on the helmet energy absorbing liner. HP Series, Carbon Series and Pro Series helmets are only available with FIA8858-2010 Hans® post clips fitted as original equipment. Sport Series helmets are available with or without FIA8858-2010 Hans® post clips fitted as original equipment. The Hans versions feature Hans "Post Anchor Clips" already bolted to the M6 terminals as original equipment. The regular versions ("non Hans") feature the same M6 terminals ready to easily receive the latest generation of FHR anchor clips.