They are poor quality, low cost items.In the UK, often they are called ****part
The Orange shocks that Britpart do are better quality.
https://www.britpart.com/parts/suspension-and-axle/shock-absorbers/britpart-cellular-dynamic
As are the oil...
I chose Britpart yellow "Super Gas" and three months later am sorely disappointed. No offroading just French towns- there are some similarities.. I now have to change shocks again..
Having fitted yellow Britpart "Super Gas" rear shock absorbers (dampers to our American brothers) I have to say that after just three months I am rather disappointed, one started squeaking after just two months, now they both are, and the ride...