Lot of 6 Pneumatic table leveling/vibration isolators legs laser,optical table?

Description

This is for a lot of  six Pneumatic table leveling/ vibration isolators legs, for laser,optical table? There are two different isolators  three large ones with a 11-7/8" square top and bottom mounting plates. The other three are smaller with a 9-1/2" square top and bottom mounting plates.The three large ones  have what look like a senor/ positioning switch of some sort I'm no sure about that though.(see last picture).  The height on these is about 7-1/4" and looks like the can adjust up to 8-1/4".
I do not have any more information on these and they look to been in good condition but have not been tested.
Please look carefully and bid accordingly no returns!
These are very heavy and are for local pick up.
I could only ship the UPS and it would be six boxes or if you would like to arrange your own truck that would be fine also.
If you would like a shipping quote please send me your zip.
Thanks you for looking!