The wiper blade sizes for BMW 4 SERIES 2014-2020 (F33) CONVERTIBLE  are:

• Front Driver:24" / 600mm
• Front Passenger:18" / 450mm
• ONS wiper features typically include:
• • All-weather performance: ONS wipers are designed to perform well in all weather conditions, including rain, snow, sleet, and ice.
  • Durability: ONS wipers are made with high-quality materials that are designed to last.
  • Quiet operation: ONS wipers are designed to operate quietly, even at high speeds.
  • Easy installation: ONS wipers are easy to install, even for beginners.