Galvanized glass beads.  Delicate feeling and looking but extremely durable. Closures are silver and 14 gold plated brass safety clasps that can be done with one hand.  No nickel content.  Available in 4 sizes - 6", 6.5", 7", 7.5".  Custom sizes also available.  For the best fit, measure your wrist and add 1/2" and order the size closest to your measurement.