The PIAA wiper blade is made of a high-quality silicone rubber compound that is resistant to all adverse climate conditions. In addition, the blade's activated silicone coating makes your windshield water-repellent, so rain beads-up and slips off the windshield. The wiper frames are aerodynamically designed to help keep the rubber on the glass at highway speeds, and to protect against corrosion, the frames are zinc-plated and then powder coated. Each frame is properly balanced to provide equal pressure on the windshield to prolong blade life; this design also gives you clearer, noise-free operation.