They look like the generic Chinese clone saws, there are various different plastics for them. You can get all the parts for them on alixepress. If it's a well pit together one they are pretty good, from memory the carbs are a bit small on the 50cc plus versions. I've got one I played with during lockdown that started out at 45cc, ended up at 55cc with a ported cylinder an piston modified squish clearance and bigger carb. It cuts significantly faster than my MS260 but is a bastard to start and not as nice to use
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