49 Silver Strand Wire Flat Spools - 0.40mm is a silver strand bead stringing wire combines the flexibility and convenience of thread with the strength and durability of stainless steel wire. Specially designed for stringing ceramic, glass, metal and stoned beads as well as seed beads and freshwater pearls. 49 strands is the softest and most flexible. This strand is 0.40mm in diameter. The spool contains approx. 30 feet of wire.