10-13 KAWASAKI Z1000: Zero Gravity Double Bubble Windscreen (DARK SMOKE) The Zero Gravity&#174; Double Bubble&#174; has changed the face of the sportbike industry. This innovative "bubble within a bubble" concept was pioneered by Zero Gravity&#174; and has pushed modern day race bikes to their peak performance level. From Zero Gravity&#174;&#39;s first inception of a performance windscreen, the Double Bubble&#174; is Zero Gravity&#39;s version of the now popular "stepped profile" design, pioneered by Zero Gravity Racing in the mid-90&#39;s.Sculpted to the sport bike&# fairing for a precision fit.Used by the best Superbike, Grand Prix, Supersport and Endurance teams in America, Zero Gravity windscreens dominate road racing.Measurements Explained:A: The total length from the nose to the highest trailing center edge.B: Fr