National Cycle VStream 7-1/4&Prime, Dark Tint Windshield N20405 VStream windshields from National Cycle are effective in reducing wind turbulence, buffering and noise 4.5mm polycarbonate for outstanding impact strength 20X greater than acrylic Quantum hardcoating provides unbeatable scratch resistance Dark 89% tint reduces glare in bright sun Covered by National Cycles 3-Year Manufacturers Warranty against breakage!