Bosch 421B 21" Beam Exclusive fx dual rubber resists heat and ozone deterioration and proven to last up to 40% longer than other premium wiper blades Easy installation with original equipment-quality adapter Patented beam design with shielded connector optimizes visibility even under extreme weather conditions Exclusive tension spring arcing technology creates a fit thats custom-contoured to the curvature of each side of the windshield Flexible asymmetric spoiler distributes uniform downward force along the entire blade to hold it firmly to the windshield at higher speeds