Beadalon 49-strand stringing cable. 0.030" (0.76mm) diameter, 42-lb test. 30ft spool of approximately 20-gauge wire. Doesn't stretch, even with heavy beads. Use with size #41-256-04-3 crimp tubes. Great for stringing crystal necklaces and glass beads. Also great for making chokers that look like sterling Israeli and Polish versions. Very easy to use, no needle required!