Zero Gravity Double Bubble Windscreen - Dark Smoke 16-406-19All Zero Gravity windscreens offer superior optical quality, strength plus flexibility, exceptional fit and finish, plus race proven performance Developed by Zero Gravity R&D in 1995 for Team ZGs race bikes, the Double Bubble is now seen on race tracks around the world Made from the finest grade of 1 8in. acrylic plastic. Each windscreen is stretched as it is formed, a process which results in superior strength and flexibility. This flexibility allows