Bead Pearl Stone Stringing Cord Size #6 FF 40 colors 3 yds each. Made in USA Beading Cord Sampler Size #6 Pack of 40 colors! 3 yds each. Size 6 Bonded Nylon Beading Cord. Very strong. Great for knotting. Very strong. Great for knotting. Can be used with or without a needle. Use double or single. Size 6 is equivalent to letter size FF. Made in USA.