>>1503550they are made in china and are an clone of Shimano SL-TY22
most of the cost saving is in not paying their workers and doing large batch runs
some of it is in using lesser quality plastics and metals
also its an obsolete design, they most likely bought the tooling second hand to set up their production
the real shimano ones are fairly good
but the clicks on the fake ones are a bit chunky, still works tho
the ones in your link are advertised as being friction only
odd compared to all the clones I have seen IRL
>>1503552sunrace is gud sunway is better
that lever is a little short but at least the tension screw has a metal handle on it
>>1503566those are 1980s style they are among the earlier handle bar mounted friction shifters
work fairly well but it pays to keep an eye on the tension screw and tighten it by hand from time to time
the little bit of plastic on top is sitting around an 8 sided bolt head
but does not provide much leverage
