Once the tires meet the requirements of the vehicle manufacturer, some apply a specific designation showing that the tire is approved and developed specifically for their vehicles.
Continental offers an extensive range of original equipment tires. OE keys on the sidewalls show which brand and model an OE tire has been made for. But even if no marking is visible, you can be reassured that the tire is particularly manufactured for the specific car brand. The table below provides an overview of existing OE keys.