Gomitolo Finito is a DK weight yarn of 100% Merino Wool and each cake of 200 grams gives about 570 yards. 

What makes this yarn especially unique is how it is dyed. 

This colorway is called Rainbow Blacks and the cake starts out with glorious rainbow colors.  Then the yarn goes into black into charcoal into white for longer stretches before it goes back into the rainbow colors.  

*****

The third photo on this page shows how it knits up.