What kind of shocks are these? Oil filled?

#1
What kind of shocks are these? Are they oil filled? They look like they could be oil filled plus they don't pogo stick and aren't bouncy like other minibike shocks. They are on a Wards 525 but I don't know if they are original to it or added on.
They measure about 12 3/8" eye to eye.
Thanks
Danford1
 
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