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This NHK GP R Tech Street series is our replica model that is widely used throughout several championships all over the world. NHK GP R Tech Street that comes with Thermo Polymer shell is a replica of the original shell that use for racing, but this Street series CAN NOT USE FOR RACING TRACK. This NHK GP R Tech Street series also comes with 2 versions shell. This helmet equipped with the new inner lining system for maximum noise reduction, cool feeling, and optimal comfort. Furthermore, this helmet has an aero flow dynamic system for no turbulence experience.