I have one spool of unopened elastic that is 6mm or 1/4" wide.
This was made in China.

I have no idea how much is in the spool - I can't remember now.
It could be 288 yards or 200 yards. The only way I would be able to tell is to unwrap it and unwind it which I'm not going to do.
The majority of the spools I used to buy were 288 yards but again I'm not sure.

The spool weighs almost 14 oz and will be shipped First Class mail.

I also have some other black and white elastic already cut and packaged in 5 yard increments but this is for the entire spool.

If you look at the picture this spool does not have elastic that goes to the outer edge of the spool so buy accordingly; however, this was never opened.