Nymo is a very popular nylon beading thread used for loom and off-loom beading alike. It is flat and threads into the flat eye of a beading needle easily. Run thread through beeswax for best results.
Nymo Cones are 3 oz  -  "OO" has the most at 4852 yds., "F" has the fewest: 1049 yds. The rest are somewhere in between.

"OO" is finest (for beads 18/0 and smaller-#15 needles); (- -)
"O" (18/0-13/0-#15,#13 needles); (-)
"B" (for 13/0-11/0-#12,#10 needles); (+/-)
"D" (for 11/0 and larger beads- #10 needles); (+)
"F" is the thickest (++)