Soft Flex® Wire Beading Wire was developed by beaders for beaders. It is constructed of 49 micro spun, marine quality, stainless steel wires woven together and then nylon coated. Soft Flex Wire is hypoallergenic and can beworn in and out of salt or fresh water. It is one the most flexible and knottable stainless steel wires available. Knotting will not cause any loss of strength or durability. Made in the USA. Extreme Flex Wire is the world's first eco-friendly beading wire. This bright, attractive wire is free of heavy metals and will not tarnish. Extreme Wire is constructed of 1 x 19 micro woven metal alloy wires with an extreme abrasion resistant nylon coating.