The MCF Flipper Bobbins with their unique patented double clip system accentuates the slightest movement of the lead. The heads feature an internal clip that can be adjusted to suit different line diameters, this clip creates a fixed indicator, a bit like an “Elstow” type indicator, however once the line pulls free of the clip on a take rather than just dropping off the line and giving no further indication the line then runs through the integral stainless “ball clip” giving indication right up to the point that you strike the bobbin off.