Bosch Twin Standard 3397118408 Original Equipment Replacement Wiper Blade - 21"/21" (Set of 2) Smooth, quiet operation with 20% longer performance life vs. other premium wiper blades Exclusive weather shield connector system is pre-installed to protect arm connection from snow/ice build-up Dual precision-tensioned steel springs help create tension memory, applying uniform pressure along the entire blade length Exclusive FX dual-rubber-technology flex element resists ozone damage and hardening Aerodynamic wind spoiler creates downforce, preventing blade lift-off