Magforce V system which works by applying magnetic braking to the spool only at maximum spool speed. Part of the reason the TD-X103HSDF accelerates so fast is that at the start of the cast the spools inductor cup is pulled back from the magnets, so their is absolutely no resistance. When the spool approaches maximum speed the inductor cup moves into the gap gradually and will actually pull back when the spool begins to slow, so you get the very most out of your cast!