You get BOTH (2) 5-ounce Celestron balance weights for the C8, C5, and C90.
On the C90 Astro, you thread one of these weights into the back (where the mirror housing is) for balancing on the single arm. If these weights to balance the ota, you will need a special aluminum clamp to fit to the end of the telescope (where the corrector plate is).
WEIGHT STICKER ON EACH WEIGHT CAN BE EASILY REMOVED.
These are in fantastic condition for being from the late 1970s. No rust issues, bad threads, ect.
These weights ARE stackable with the 10oz and 15oz models in any combination you need.
The male and female threads are #10-24. If you have a schmidt or maksutov telescope with these threads for screws on the end of the ota, these weights will work with it.
All nations welcome to bid.