No difference 3-5 or 7 blades, waste of money. Take the most common cassettes of this series with three blades, it makes no sense to pay more. The only thing is that the cheapest cassettes and fakes have the most. Be careful. Its pros: Skin lubrication is slightly better than on the cheapest cassette in this series Some cons: Shaves exactly the same as the cheapest cassettes of this series
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