D2FC-F-7N: 5 million times, feel the middle distance,
D2FC-F-7N 10M: 10 million times, feel slightly softer than a little bit
D2FC-F-7N 20M: 20 million times, feel a little soft crisp, silver alloy contacts, shrapnel slightly thicker
D2FC-F-7N 10M OF: enhanced version of D2FC-F-7N 10M, compared to the ordinary 7N (10M) the actual life is higher, even more efforts to rebound, domestic 0.74N series, is very hard and brittle one, can use the "rebound force simply fall" to describe this kind of Fretting
20M OF: more uniform, conservative life 20 million (20M and 10M (OF) is a new model)
D2FC-F-K (50M)Blue point): some of the early MS is similar, the same flexibility, more uniform intensity, relative to 20M OF slightly softer! Life up to 500 million times