I have 3 spools Ribbon pinks and black Vintage Item.  The black and light pink are 1/2".  The light pink with the grosgrain like patter is 5/8".  I am selling them wholesale, the full rolls.  I would estimate there would be between 8 - 12   yards on each of them.  The ribbon looks like it may be taffeta - it could have a blend of fibers, I'm not sure.  There are a series of pin holes in the ribbons from where a 1/2" pin has secured it for years, this would not go through the full roll.  I tried to show the pin holes in my photo's.   I'm not sure if by wetting this you could get the fibers to hide the holes or not.  The holes get smaller as the roll is unwound.  The 1/2" ribbons measure about 2 5/8" across the center of the ribbon spools, the grosgrain ribbon is about 3" across with the wood centers being about 1 1/4" across.  

3 Ribbon spools many yards Vintage