I think I had very high expectations for this machine; I can't say much about the stroke but it lacks a lot of strength and when adjusting the output of the needle/grip it squeals a lot.
If you want it to practice, that's fine, for more professional jobs I don't recommend it; I spend an hour and a half working evenly and then the strength decreased...

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Роторная тату-ручка, картриджная машина с разъемом RCA для татуировок, аксессуары для тату-мастера - черные