Dose this come with the holder to hang it up ?

No, it's just the curtain with slot for a rod.
Is this see through?

Technically, yes. It is a delicate see-thru fabric with teenie tiny sequins. It worked very well for our photobooth.
Is the 2x8ft two panel that are each 2ft by 8ft ?

It's two panel that are each 2ft by 8ft.
Can this be machine washed & dry ?

No! You will loose your sequin.I lightly hand wash when needed and i still loose some sequin.

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If you see sequins falling off, this is caused by bumps in the road and processing cuts. You can take it outside and shake it when you open the package, it does not affect the use.

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