Ripmax Carbon Main Blades 690mmHigh quality Carbon fibre helicopter main blades suitable for both Sport and 3D uses. The internal construction is strong and optimised to take advantage of the immense strength that helicopter blades require. When combined with the carbon fibre external laminate, they become exceptionally rigid also. The distinctive white colour scheme identifies the carbon versions yet still maintains good visibility in flight. For 700 61 91 class helicopters. (12mm