This soft flex beading wire is 49 strand stainless steel/nylon coated. Each spool contains approximately 100 feet.
Soft flex is hypoallergenic, and marine quality, so it can be worn in and out of salt water and fresh water.
The .019 diameter is for use with small to medium glass beads, crystals, silver, pewter, 80% of fresh water pearls and seed beads. It can be used with a variety of materials, and can pass through a size 13 seed bead twice.